Patent Description:
Various navigation systems provide users with turn-by-turn directions. These systems can include handheld GPS devices or mobile phones, vehicle-mounted devices, or Internet-based computers with access to a mapping application. Users input one or more locations and receive a route and turn-by-turn directions. Generally, these systems can select a fastest route based on the shortest estimated time to travel along the route. Some systems can incorporate traffic conditions, for example reports of congestion, into this calculation. Some systems can provide route information including an estimated travel time to the one or more locations.

A user can evaluate the information provided by a navigation system and/or mapping application for planning purposes. For example, route information that includes an estimated travel time to a destination location can help a user plan a departure time. More particularly, a user can select a local grocery store as a destination location to see the estimated travel time to the grocery store with live traffic information taken into account. In some instances, a user might make decisions about a desired destination based on this navigational information.

<CIT> describes a mapping system which displays a route from a departure point to a destination, together with congestion prediction information corresponding to the route, and an indication of whether there is a necessity of detouring.

One example aspect of the present disclosure is directed to a computer-implemented method in accordance with claim <NUM>.

Another example aspect of the present disclosure is directed to a user computing device in accordance with claim <NUM>.

Another example aspect of the present disclosure is directed to one or more tangible, non-transitory computer-readable media in accordance with claim <NUM>.

Other aspects of the present disclosure are directed to various systems, apparatuses, computer program products, non-transitory computer-readable media, user interfaces, and electronic devices.

Generally, the present disclosure is directed to systems and methods for generating route information that accounts for aspects of both an outbound journey and a return journey. For example, an outbound journey route from an initial location to a target destination can be determined and can include an estimated outbound journey time. A return destination route from the target destination to a return destination can also be determined and can include an estimated return journey time. According to the invention, the return destination is the initial location. Based on a comparison of the outbound journey time to the return journey time, one or more notifications can be provided to a mapping application user. Return journey notifications can include, for example, estimated return journey times, estimated differences between outbound and return journey times, warnings for predetermined route factors, and the like. By providing return journey notifications associated with the time it would take a user to return back to their starting point, such users are provided with more comprehensive and valuable trip planning information. This can be especially useful when the estimated time for a return journey is significantly different than the estimated time for an outbound journey, as might be caused when traffic is completely different on each side of a route. Such information can be very useful to a user at the time of departure so that more well-informed decisions about local travel can be made.

More particularly, in some implementations, a user computing device (e.g., a mobile computing device such as a smartphone or other mobile device, a navigation system, a laptop, a tablet, or the like) can include at least one processor and at least one tangible, non-transitory computer-readable medium that stores instructions that, when executed by the at least one processor, cause the user computing device to perform operations. The user computing device can also include a communications interface, a display device, a user input device, a geographic position component, and an accelerometer. The user computing device can also include or otherwise obtain access to (e.g., via a server computing device) a mapping application.

In some implementations, the communications interface of the user computing device can be configured to establish wireless communication over a network with one or more remote computing devices (e.g., one or more server computing devices). In some implementations, the user computing device and remote computing device(s) that are communicatively coupled via a network respectively include a mapping platform that enables map content and navigational information to be shared from one device to another via the network. The communications interface can include any suitable hardware and/or software components for interfacing with one or more networks, including for example, transmitters, receivers, ports, controllers, antennas, or other suitable components. The network can be any type of communications network, such as a local area network (e.g., intranet), wide area network (e.g., Internet), or some combination thereof and can include any number of wired or wireless links. In general, communication over the network can be carried via any type of wired and/or wireless connection, using a wide variety of communication protocols (e.g., TCP/IP, HTTP, SMTP, FTP), encodings or formats (e.g., HTML, XML), and/or protection schemes (e.g., VPN, secure HTTP, SSL).

In some implementations, the display device of the user computing device can be configured to provide various user interfaces for display to a user of the user computing device. For example, maps associated with the mapping application can be provided for display via the display device. The mapping application can generate additional data that can be provided for display via the display device, including but not limited to outbound journey routes and/or return journey routes along various road segments within a map, outbound journey distances, outbound journey times, return journey distances, return journey times, destination times, return journey notifications, contextual information regarding trip calculations, etc..

In some implementations, the user input device of the user computing device can be configured to receive instructions from a user. For example, the user input device can be a touchscreen associated with the display device, a keyboard, an eye tracking device, a mouse, a joystick, a remote control, or any other device capable of providing input to the user computing device. In some implementations, the user input device is configured to receive instructions indicative of a target destination associated with a request for navigational directions. In some implementations, the user input device is configured to receive instructions indicative of an initial location associated with a request for navigational directions. In some implementations, the user input device is configured to receive instructions indicative of a return destination associated with a request for navigational directions. In some implementations, the user input device is configured to receive instructions modifying at least one trip parameter associated with a request for navigational directions.

In some implementations, the geographic position component can include hardware and/or software configured to determine the geographic location and orientation of the user computing device. For example, geographic position component can include a GPS receiver to determine the user computing device's latitude, longitude and altitude position. In another example, the geographic position component can also include software for determining the position of the device based on other signals received at the user computing device, such as signals received at a cell phone's antenna from one or more cell phone towers if the client device is a cell phone. In still another example, the geographic position component can detect all WiFi networks in the vicinity, measure the strength of the signal from those networks, and use a table of Wi-Fi access point locations to triangulate the geographic position of the user computing device. It will be understood that any number of geographic positioning systems, alone or in combination, can be used.

In some implementations, the accelerometer (or other alternative device such as a gyroscope or the like) of the user computing device can include hardware and/or software configured to determine the direction in which the user computing device is oriented. By way of example only, the device can determine its pitch, yaw or roll (or changes thereto) relative to the direction of gravity or a plane perpendicular thereto. In that regard, it will be understood that provision of location and orientation data as set forth herein can be provided automatically to a user computing device, to a server computing device, or both.

According to an aspect of the present disclosure, the mapping application can include one or more of an outbound journey route generator, a return destination predictor, a return journey route generator, a trip time analyzer, and/or a return journey notification generator. The mapping application and various components thereof can include computer logic utilized to provide desired functionality. The mapping application can be implemented in hardware, firmware, and/or software controlling a general purpose processor. For example, in some implementations, the mapping application can include program files stored on a storage device, loaded into a memory and executed by one or more processors. In other implementations, the mapping application includes one or more sets of computer program products and/or computer-executable instructions that are stored in a tangible computer-readable storage medium such as RAM hard disk or optical or magnetic media.

The disclosure further provides a computer program product comprising computer-executable instructions for implementing the mapping application. The computer program product may be stored in a tangible computer-readable storage medium such as RAM hard disk or optical or magnetic media; or alternatively it may be downloadable over a communications network as a signal without necessarily being stored in a tangible computer-readable storage medium.

In a further aspect of the present disclosure there is provided a computer program product (whether stored on a computer-readable storage medium or otherwise) in the form of instructions which are executable by a processor of a user device to interact with a mapping application which is running on a separate computer, e.g. a remote server. For example, the instructions may be implemented to generate a user interface for receiving, and relaying to the separate computer, the instructions which are used by the mapping application, and/or for presenting to the user the notifications generated by the separate computer.

More particularly, the outbound journey route generator can be configured to determine an outbound journey route from an initial location to a target destination. In some implementations, the target destination is identified from instructions received from a user of the user computing device, for example, as part of a request for navigational directions to a particular location. In some implementations, the initial location is also identified from instructions received from a user of the user computing device. In other implementations, the initial location is determined to correspond to a current location of the user computing device as determined, for example, by the geographic position component within the user computing device. Instructions identifying a target destination, an initial location, etc. can be provided in any number of forms including street addresses, points of interest, GPS coordinates or the like.

In some implementations, the outbound journey route generator can determine a plurality of candidate outbound journey routes between the initial location and the target destination. Each candidate outbound journey route can include one or more route segments. For each route segment of a candidate outbound journey route, an estimated drive time for the route segment can be calculated based on expected traffic conditions (e.g., current traffic conditions and/or historical traffic conditions as determined relative to an outbound start time). For example, the outbound route generation process can begin by estimating that a user will leave a current/initial location for a target destination immediately (or at some other specified outbound start time). Thus, the user would be moving along a given outbound journey route segment at the present time. The outbound journey route generator can determine from time period information associated with the given outbound journey route segment the estimated number of vehicles that are located or are expected to be located along the given outbound journey route segment at the present time. Using the estimated number of vehicles and a capacity index, the outbound journey route generator can determine an approximate time of travel along the given outbound journey route segment.

The outbound journey route generator can determine the approximate time of travel along the next outbound journey route segment based on the approximate time of travel of the previous outbound journey route segment. For example, if a determination is made that it will take approximately two (<NUM>) minutes to move along a first outbound journey route segment and get to a second outbound journey route segment, the outbound journey route generator will determine from the time period information associated with the first outbound journey route segment, the estimated number of vehicles that will be located along the second outbound journey route segment at two (<NUM>) minutes from the present time. Using the estimated number of vehicles and the capacity index, the outbound journey route generator can determine an approximate time of travel along the second outbound journey route segment. The outbound journey route generator can repeat this process for subsequent outbound journey route segments until arrival at the target destination.

Once the outbound journey route generator has determined the estimated travel time for each route segment of an outbound journey route, the outbound journey route generator can determine an estimated outbound journey time for the entire outbound journey route by determining the sum of the estimated travel times for each of the outbound journey route segments. In some implementations, the outbound journey route generator can select a fastest route by comparing the estimated outbound journey times of a plurality of candidate routes. In some implementations, the outbound journey route generator can also generate turn-by-turn directions based on the determined outbound journey route and provide such directions for display to the user computing device.

According to another aspect of the present disclosure, the return destination predictor can be configured to determine a return destination to which a user is predicted to return after traveling to the target destination. According to the invention, the return destination corresponds to the initial location for which an outbound journey route is generated. In some implementations, the return destination can be based on a current location associated with a user computing device from which the request for navigational directions is received. In some implementations, the return destination can be determined based on input received from a user computing device from which the request for navigational directions is received. For example, a user can specify a particular return destination via a user interface provided within the mapping application.

In some implementations, the return destination predictor can determine a return destination based on a history of locations visited by a user computing device from which the request for navigational directions is received. For example, user location history can indicate one or more common journey patterns that can help determine a predicted return destination. For instance, a common journey pattern can indicate that when a user leaves a first location (e.g., work) at a particular time of day (e.g., near close of business time) to travel to a second location corresponding to a target destination (e.g., the grocery store), the return destination typically corresponds to a third location (e.g., home). Alternatively, a common journey pattern can indicate that when a user leaves a first location (e.g., home) at a particular time of day (e.g., near start of school time) to travel to a second location corresponding to a target destination (e.g., a child's school), the return destination typically corresponds to the first location (e.g., home).

In some implementations, the return destination predictor can determine a return destination based on a category associated with the target destination. For example, when a user requests navigational directions to a particular point of interest such as "Café ABC," the return destination predictor can determine a category of "restaurant" associated with the "Café ABC" target destination. This category associated with the target destination can be used in analyzing user location history to identify common journey patterns that can help identify a return destination. For example, if user location history indicates that a user often travels from an initial location (e.g., "work") at a particular time of day (e.g., lunchtime) to one or more various target destinations associated with a particular category (e.g., a variety of restaurants), and a user requests navigational directions around lunchtime to Café XYZ, then a return destination of "work" can be predicted.

Once a return destination is specified by a user or otherwise determined by the return destination predictor, a return journey route can be generated by return journey route generator.

More particularly, the return journey route generator can be configured to determine a return journey route from the target destination to the return destination. According to the invention, the return destination is the same as an initial location such that the return journey route can follow some or all of the same road segments as the outbound journey route. However, since traffic heading in one direction along a road segment versus another direction (e.g., an opposite direction) occurs in different lanes along such road segments, the traffic conditions and corresponding travel times associated with a return journey route can be different than an outbound journey route on the same road segment(s). In some implementations, the return journey route follows some of all of a different set of road segments than the outbound journey route. Even when the return destination is the same as the initial location, different road segments can be traversed when lane patterns, traffic conditions, or other factors result in a different return journey route being faster than a return journey route corresponding to the outbound journey route.

In some implementations, the return journey route generator can determine a plurality of candidate return journey routes between the target destination and the return destination. Each candidate return journey route can include one or more route segments. For each route segment of a candidate return journey route, an estimated drive time for the route segment can be calculated based on expected traffic conditions (e.g., current traffic conditions and/or historical traffic conditions as determined relative to a return start time). A return start time can be determined as a sum of the estimated outbound journey time plus an estimated destination time. The estimated destination time can correspond to an amount of time a user is predicted to spend at the target destination. In some implementations, the estimated destination time can be determined based on historical data indicative of an average amount of time multiple users spend at the target destination. For example, if the average user spends <NUM> minutes shopping in Store ABC during a particular day and timeframe, then the destination time can be estimated at <NUM> minutes. Additionally or alternatively, the estimated destination time can be determined based on historical data indicative of an average amount of time the user spends at the target destination. For example, if the average user spends <NUM> minutes at his child's school for pickup on a particular day of the week and timeframe, then the destination time can be estimated at <NUM> minutes.

More particularly, the return journey route generation process can begin by determining that a user will leave the target destination at a return start time equal to the sum of the estimated outbound journey time plus the estimated destination time. The return journey route generator can determine from time period information associated with the given return journey route segment the estimated number of vehicles that are located or expected to be located along the given return journey route segment at the return start time. Using the estimated number of vehicles and a capacity index, the return journey route generator can determine an approximate time of travel along the given return journey route segment.

The return journey route generator can determine the approximate time of travel along the next return journey route segment based on the approximate time of travel of the previous return journey route segment. For example, if a determination is made that it will take approximately two (<NUM>) minutes to move along a first return journey route segment and get to a second return journey route segment, the return journey route generator will determine from the time period information associated with the first return journey route segment, the estimated number of vehicles that will be located along the second return journey route segment at two (<NUM>) minutes from the return start time. Using the estimated number of vehicles and the capacity index, the return journey route generator can determine an approximate time of travel along the second return journey route segment. The return journey route generator can repeat this process for subsequent route segments until arrival at the return destination.

Once the return journey route generator has determined the estimated travel time for each route segment of a return journey route, the return journey route generator can determine an estimated return journey time for the entire return journey route by determining the sum of the estimated travel times for each of the return journey route segments. In some implementations, the return journey route generator can select a fastest route by comparing the estimated return journey times of a plurality of candidate routes. In some implementations, the return journey route generator can also generate turn-by-turn directions based on the determined return journey route and provide such directions for display to the user computing device.

According to another aspect of the present disclosure, the trip time analyzer is configured to compare the estimated outbound journey time to the estimated return journey time. According to the invention, the trip time analyzer determines when the comparison of the estimated outbound journey time to the estimated return journey time results in a determination that the estimated return journey time is greater than the estimated outbound journey time. In another example, it is determined that the estimated return journey time is greater than the estimated outbound journey time plus some predetermined threshold value (e.g., a certain predetermined increment of time or a predetermined percentage of the estimated outbound journey time).

Aspects of the trip time analyzer can be coupled with aspects of the return journey notification generator such that return journey notifications can be generated and ultimately provided for display on a user computing device when various criteria are met as determined by the trip time analyzer. For example, a return journey notification can be generated and/or provided (e.g., from a server computing device to the user computing device) when comparing the estimated outbound journey time to the estimated return journey time results in a determination that one or more predetermined criteria are met as evaluated by the trip time analyzer.

In some implementations, a notification provided by the return journey notification generator can correspond to a warning icon provided on a user interface. In some implementations, a notification provided by the return journey notification generator can correspond to an identification of the estimated return journey time. In some implementations, a notification provided by the return journey notification generator can correspond to a time difference between the estimated outbound journey time and the estimated return journey time. In some implementations, a notification provided by the return journey notification generator can correspond to a warning regarding expected traffic on the return journey route. It should be appreciated that other forms of warnings and/or textual advice can be provided via the return journey notification generator (e.g., "Leave now to avoid traffic on the return journey.

In some implementations, a notification provided via the return journey notification generator can correspond to a contextual explanation of how one or more of the estimated outbound journey time, the predicted return destination, the estimated destination time, and/or the estimated return journey time is determined. These contextual explanations can also be coupled with user interface features by which a user can change certain estimated assumptions to improve the accuracy of predicted aspects associated with a return journey route. More particularly, user interface features can be provided to receive instructions modifying at least one trip parameter. For example, the trip parameter may be a parameter generated in response to the request for navigational directions, by any one of the output journey route generator, the return destination predictor, the return journey route generator, the trip time analyzer or the return journey notification generator (e.g., a predicted return destination, an estimated destination time, etc.).

In some implementations, a notification provided via the return journey notification generator can include an alternate target destination than the target destination initially associated with a request for navigational directions. For example, if an alternate target destination (e.g., a second grocery store) has an estimated alternate outbound journey time and estimated alternate return journey time that is less than the estimated outbound journey time and the estimated return journey time associated with travel to a first grocery store, then a return journey notification can include a suggestion to select the alternate target destination. Alternate target destinations can be provided for display on a map or other user interface along with information including an estimated outbound journey time and estimated return journey time for the alternate target destination. In some implementations, alternate target destinations can be determined at least in part based on user location history. By determining an alternate target destination that a given user has actually visited before, the mapping application can enhance the likelihood of determining desirable alternate target destinations for each user.

The systems and methods described herein can provide a number of technical effects and benefits. For instance, the disclosed techniques can advantageously solve a problem regarding comprehensiveness of travel information provided by a navigation system. In addition to providing travel information associated with an outbound journey, the disclosed techniques can also provide travel information associated with a return journey. As such, a mapping application can generate more comprehensive navigational information that analyzes beyond what a user is going to do once they reach a target destination to include a user's time spent at a target destination as well as a user's return to his initial location or a next destination. By providing return journey notifications associated with the time it would take a user to return back to a starting point, users are provided with more comprehensive and valuable trip planning information. This can be especially useful when the estimated time for a return journey is significantly different than the estimated time for an outbound journey, as might be caused when traffic is completely different on each side of a route. Such information can be very useful to a user at the time of departure so they can make more well-informed decisions about local travel.

Another example technical effect and benefit of the present disclosure lies in an ability of the disclosed systems and methods to determine when it is appropriate or otherwise desired to generate the above-described travel information associated with a return journey. It may not be appropriate to always generate return journey travel information, such as when the destination time a user expects to be at a target destination exceeds a threshold period of time (e.g., several hours or several days). As such, in some implementations, the disclosed technology provides features for determining a category associated with a target destination, for determining an estimated destination time and/or determining a predicted return destination. Generating return journey notifications can be determined based on one or more of the category associated with the target destination, the estimated destination time, the predicted return destination and/or the estimated return journey time. Features can also be provided for determining when it is appropriate or otherwise desired to determine an alternate target destination, outbound journey route, and/or return journey route when travel times associated with an original target destination are longer than normal.

A still further technical effect and benefit of the present disclosure is the customizable nature of possible notifications available to a user to improve the overall comprehensiveness and effectiveness of navigational directions provided to users of a mapping application. More particularly, numerous different types of user interfaces and associated notifications can be provided for display to a mapping application user. For example, in some implementations, maps can be provided that depict both an outbound journey route and a return journey route. In some implementations, notifications can include an identification of the estimated return journey time, a time difference between the estimated outbound journey time and the estimated return journey time, and/or a warning regarding expected traffic on the return journey route. Still further, notifications can include a contextual explanation of how one or more of an estimated outbound journey time, an estimated destination time, or an estimated return journey time is determined. User interface features can be provided by which a user can change one or more of the data variables associated with the contextual explanation and assumptions regarding calculation of the various trip times. As such, trip time estimations and return journey notifications can be further customized and improved by a mapping application user.

<FIG> depicts a block diagram of an example system <NUM> including a user computing device <NUM> (e.g., a mobile computing device such as a smartphone or other mobile device, a navigation system, a laptop, a tablet, or the like). User computing device <NUM> can include one or more processors <NUM> and at least one memory <NUM>. The one or more processors <NUM> can be any suitable processing device (e.g., a processor core, a microprocessor, an ASIC, a FPGA, a controller, a microcontroller, etc.) and can be one processor or a plurality of processors that are operatively connected. The memory <NUM> can include one or more non-transitory computer-readable storage mediums, such as RAM, ROM, EEPROM, EPROM, flash memory devices, magnetic disks, etc., and combinations thereof. The memory <NUM> can store data and instructions which are executed by the processor(s) <NUM> to cause the user computing device <NUM> to perform operations. The user computing device <NUM> can also include a communications interface <NUM> that enables communications over one or more networks (e.g., network <NUM>), as well as a display device <NUM>, a user input device <NUM>, a geographic position component <NUM>, and an accelerometer <NUM>. The user computing device <NUM> can also include or otherwise obtain access to (e.g., via a server computing device <NUM>) a mapping application <NUM>.

In some implementations, the communications interface <NUM> of the user computing device <NUM> can be configured to establish wireless communication over network <NUM> with one or more remote computing devices (e.g., one or more server computing devices <NUM>). In some implementations, the user computing device <NUM> and server computing device(s) <NUM> that are communicatively coupled via network <NUM> respectively include a mapping platform that enables map content and navigational information to be shared from one device to another via the network <NUM>. The communications interface <NUM> can include any suitable hardware and/or software components for interfacing with one or more networks, including for example, transmitters, receivers, ports, controllers, antennas, or other suitable components.

In some implementations, the display device <NUM> of the user computing device <NUM> can be configured to provide various user interfaces for display to a user of the user computing device <NUM>. For example, maps associated with the mapping application <NUM> can be provided for display via the display device <NUM>. The mapping application <NUM> can generate additional data that can be provided for display via the display device <NUM>, including but not limited to outbound journey routes and/or return journey routes along various road segments within a map, outbound journey distances, outbound journey times, return journey distances, return journey times, destination times, return journey notifications, contextual information regarding trip calculations, etc..

In some implementations, the user input device <NUM> of the user computing device <NUM> can be configured to receive instructions from a user. For example, the user input device <NUM> can be a touchscreen associated with the display device <NUM>, a keyboard, an eye tracking device, a mouse, a joystick, a remote control, or any other device capable of providing input to the user computing device <NUM>. In some implementations, the user input device <NUM> is configured to receive instructions indicative of a target destination associated with a request for navigational directions. In some implementations, the user input device <NUM> is configured to receive instructions indicative of an initial location associated with a request for navigational directions. In some implementations, the user input device <NUM> is configured to receive instructions indicative of a return destination associated with a request for navigational directions. In some implementations, the user input device <NUM> is configured to receive instructions modifying at least one trip parameter associated with a request for navigational directions.

In some implementations, the geographic position component <NUM> can include hardware and/or software configured to determine the geographic location and orientation of the user computing device <NUM>. For example, geographic position component <NUM> can include a GPS receiver to determine the latitude, longitude and altitude position of user computing device <NUM>. In another example, the geographic position component <NUM> can also include software for determining the position of the user computing device <NUM> based on other signals received at the user computing device <NUM>, such as signals received at a cell phone's antenna from one or more cell phone towers if the user computing device <NUM> is a cell phone. In still another example, the geographic position component <NUM> can detect all Wi-Fi networks in the vicinity, measure the strength of the signal from those networks, and use a table of Wi-Fi access point locations to triangulate the geographic position of the user computing device. It will be understood that any number of geographic positioning systems, alone or in combination, can be used.

In some implementations, the accelerometer <NUM> (or other alternative device such as a gyroscope or the like) of the user computing device <NUM> can include hardware and/or software configured to determine the direction in which the user computing device <NUM> is oriented. By way of example only, the device can determine its pitch, yaw or roll (or changes thereto) relative to the direction of gravity or a plane perpendicular thereto. In that regard, it will be understood that provision of location and orientation data as set forth herein can be provided automatically to a user computing device <NUM>, to a server computing device <NUM>, or both.

According to an aspect of the present disclosure, the mapping application <NUM> can include one or more of an outbound journey route generator <NUM>, a return destination predictor <NUM>, a return journey route generator <NUM>, a trip time analyzer <NUM>, and/or a return journey notification generator <NUM>. The mapping application <NUM> and various components thereof can include computer logic utilized to provide desired functionality. The mapping application <NUM> can be implemented in hardware, firmware, and/or software controlling a general purpose processor. For example, in some implementations, the mapping application <NUM> can include program files stored on a storage device, loaded into a memory and executed by one or more processors. In other implementations, the mapping application <NUM> includes one or more sets of computer-executable instructions that are stored in a tangible computer-readable storage medium such as RAM hard disk or optical or magnetic media.

More particularly, the outbound journey route generator <NUM> can be configured to determine an outbound journey route from an initial location to a target destination. In some implementations, the target destination is identified from instructions received from a user of the user computing device <NUM>, for example, as part of a request for navigational directions to a particular location. In some implementations, the initial location is also identified from instructions received from a user of the user computing device <NUM>. In other implementations, the initial location is determined to correspond to a current location of the user computing device <NUM> as determined, for example, by the geographic position component <NUM> within the user computing device <NUM>. Instructions identifying a target destination, an initial location, etc. can be provided in any number of forms including street addresses, points of interest, GPS coordinates or the like.

In some implementations, the outbound journey route generator <NUM> can determine a plurality of candidate outbound journey routes between the initial location and the target destination. Each candidate outbound journey route can include one or more route segments. For each route segment of a candidate outbound journey route, an estimated drive time for the route segment can be calculated based on expected traffic conditions (e.g., current traffic conditions and/or historical traffic conditions as determined relative to an outbound start time). In some implementations, traffic conditions can be determined from traffic information <NUM> provided as part of a mapping database <NUM>.

For example, the outbound route generation process can begin by estimating that a user will leave a current/initial location for a target destination immediately (or at some other specified outbound start time). Thus, the user would be moving along a given outbound journey route segment at the present time. The outbound journey route generator can determine from time period information associated with the given outbound journey route segment the estimated number of vehicles that are located or are expected to be located along the given outbound journey route segment at the present time. Using the estimated number of vehicles and a capacity index, the outbound journey route generator <NUM> can determine an approximate time of travel along the given outbound journey route segment.

The outbound journey route generator <NUM> can determine the approximate time of travel along the next outbound journey route segment based on the approximate time of travel of the previous outbound journey route segment. For example, if a determination is made that it will take approximately two (<NUM>) minutes to move along a first outbound journey route segment and get to a second outbound journey route segment, the outbound journey route generator <NUM> will determine from the time period information associated with the first outbound journey route segment, the estimated number of vehicles that will be located along the second outbound journey route segment at two (<NUM>) minutes from the present time. Using the estimated number of vehicles and the capacity index, the outbound journey route generator <NUM> can determine an approximate time of travel along the second outbound journey route segment. The outbound journey route generator <NUM> can repeat this process for subsequent outbound journey route segments until arrival at the target destination.

Once the outbound journey route generator <NUM> has determined the estimated travel time for each route segment of an outbound journey route, the outbound journey route generator <NUM> can determine an estimated outbound journey time for the entire outbound journey route by determining the sum of the estimated travel times for each of the outbound journey route segments. In some implementations, the outbound journey route generator <NUM> can select a fastest route by comparing the estimated outbound journey times of a plurality of candidate routes. In some implementations, the outbound journey route generator <NUM> can also generate turn-by-turn directions based on the determined outbound journey route and provide such directions for display to the user computing device <NUM> (e.g., via display device <NUM>).

According to another aspect of the present disclosure, mapping application <NUM> can include features for determining when it is appropriate or otherwise desired to generate return journey information associated with an outbound journey route determined by outbound journey route generator <NUM>. It may not always be appropriate to generate return journey travel information. This may be the case for certain categories of target destinations (e.g., a target destination corresponds to an airport where a user plans to park for a trip) and/or when the destination time a user expects to be at a target destination exceeds a threshold period of time (e.g., several hours or several days). As such, mapping application <NUM> can be configured to determine a likelihood (e.g., a confidence score or other quantifiable value) that a given outbound journey is associated with a corresponding return journey (i.e., whether the user is likely to embark on a back and forth trip). When this determined likelihood exceeds a threshold value, then mapping application <NUM> can be configured to proceed with other system features, including the return destination predictor <NUM>, return journey route generator <NUM>, trip time analyzer <NUM>, and/or return journey notification generator <NUM>.

According to another aspect of the present disclosure, the return destination predictor <NUM> can be configured to determine a return destination to which a user is predicted to return after traveling to the target destination. According to the invention, the return destination corresponds to the initial location for which an outbound journey route is generated. In some implementations, the return destination can be based on a current location associated with a user computing device <NUM> from which the request for navigational directions is received. In some implementations, the return destination can be determined based on input received from a user computing device <NUM> from which the request for navigational directions is received. For example, a user can specify a particular return destination via a user interface provided within the mapping application.

In some implementations, the return destination predictor <NUM> can determine a return destination based on a history of locations visited by a user computing device <NUM> from which the request for navigational directions is received. In some implementations, a user location history <NUM> can be provided as part of mapping database <NUM>. For example, user location history <NUM> can indicate one or more common journey patterns that can help determine a predicted return destination. For instance, a common journey pattern can indicate that when a user leaves a first location (e.g., work) at a particular time of day (e.g., near close of business time) to travel to a second location corresponding to a target destination (e.g., the grocery store), the return destination typically corresponds to a third location (e.g., home). Alternatively, a common journey pattern can indicate that when a user leaves a first location (e.g., home) at a particular time of day (e.g., near start of school time) to travel to a second location corresponding to a target destination (e.g., a child's school), the return destination typically corresponds to the first location (e.g., home).

In some implementations, the return destination predictor <NUM> can determine a return destination based on a category associated with the target destination. The category may be one of a plurality of predefined categories, each associated in a destination database with a corresponding set of one or more possible destinations. For example, when a user requests navigational directions to a particular point of interest such as "Café ABC," the return destination predictor can determine a category of "restaurant" associated with the "Café ABC" target destination. This category associated with the target destination can be used in analyzing user location history to identify common journey patterns that can help identify a return destination. For example, if user location history indicates that a user often travels from an initial location (e.g., "work") at a particular time of day (e.g., lunchtime) to one or more various target destinations associated with a particular category (e.g., a variety of restaurants), and a user requests navigational directions around lunchtime to Café XYZ, then a return destination of "work" can be predicted.

Once a return destination is specified by a user or otherwise determined by the return destination predictor <NUM>, a return journey route can be generated by return journey route generator <NUM>. More particularly, the return journey route generator <NUM> can be configured to determine a return journey route from the target destination to the return destination According to the invention, the return destination is the same as an initial location, such that the return journey route can follow some or all of the same road segments as the outbound journey route. However, since traffic heading in one direction along a road segment versus another direction (e.g., an opposite direction) occurs in different lanes along such road segments, the traffic conditions and corresponding travel times associated with a return journey route can be different than an outbound journey route on the same road segment(s). In some implementations, the return journey route can follow some of all of a different set of road segments than the outbound journey route. Even when the return destination is the same as the initial location, different road segments can be traversed when lane patterns, traffic conditions, or other factors result in a different return journey route being faster than a return journey route corresponding to the outbound journey route.

In some implementations, the return journey route generator <NUM> can determine a plurality of candidate return journey routes between the target destination and the return destination. Each candidate return journey route can include one or more route segments. For each route segment of a candidate return journey route, an estimated drive time for the route segment can be calculated based on expected traffic conditions (e.g., current traffic conditions and/or historical traffic conditions as determined relative to a return start time). A return start time can be determined as a sum of the estimated outbound journey time plus an estimated destination time. The estimated destination time can correspond to an amount of time a user is predicted to spend at the target destination. In some implementations, the estimated destination time can be determined based on historical data indicative of an average amount of time multiple users spend at the target destination. For example, if the average user spends <NUM> minutes shopping in Store ABC during a particular day and timeframe, then the destination time can be estimated at <NUM> minutes. Additionally or alternatively, the estimated destination time can be determined based on historical data indicative of an average amount of time the user spends at the target destination. The determination of the estimated destination time may use an estimated arrival time at the target destination. For example, if the average user spends <NUM> minutes at his child's school for pickup on a particular day of the week and timeframe, then, if the estimated arrival time corresponds to that day of the week and timeframe, the destination time can be estimated at <NUM> minutes.

More particularly, the return journey route generation process can begin by determining that a user will leave the target destination at a return start time equal to the sum of the estimated outbound journey time plus the estimated destination time. The return journey route generator <NUM> can determine from time period information associated with the given return journey route segment the estimated number of vehicles that are located or expected to be located along the given return journey route segment at the return start time. Using the estimated number of vehicles and a capacity index, the return journey route generator <NUM> can determine an approximate time of travel along the given return journey route segment.

The return journey route generator <NUM> can determine the approximate time of travel along the next return journey route segment based on the approximate time of travel of the previous return journey route segment. For example, if a determination is made that it will take approximately two (<NUM>) minutes to move along a first return journey route segment and get to a second return journey route segment, the return journey route generator <NUM> will determine from the time period information associated with the first return journey route segment, the estimated number of vehicles that will be located along the second return journey route segment at two (<NUM>) minutes from the return start time. Using the estimated number of vehicles and the capacity index, the return journey route generator <NUM> can determine an approximate time of travel along the second return journey route segment. The return journey route generator <NUM> can repeat this process for subsequent route segments until arrival at the return destination.

Once the return journey route generator <NUM> has determined the estimated travel time for each route segment of a return journey route, the return journey route generator <NUM> can determine an estimated return journey time for the entire return journey route by determining the sum of the estimated travel times for each of the return journey route segments. In some implementations, the return journey route generator <NUM> can select a fastest route by comparing the estimated return journey times of a plurality of candidate routes. In some implementations, the return journey route generator <NUM> can also generate turn-by-turn directions based on the determined return journey route and provide such directions for display to the user computing device <NUM> (e.g., via display device <NUM>).

According to another aspect of the present disclosure, the trip time analyzer <NUM> can be configured to compare the estimated outbound journey time to the estimated return journey time. In some implementations, the trip time analyzer <NUM> can determine when the comparison of the estimated outbound journey time to the estimated return journey time results in a determination that one or more predetermined criteria are met. For example, one of the predetermined criteria can correspond to the estimated return journey time being greater than the estimated outbound journey time. In another example, one of the predetermined criteria can correspond to the estimated return journey time being greater than the estimated outbound journey time plus some predetermined threshold value (e.g., a certain predetermined increment of time or a predetermined percentage of the estimated outbound journey time). In another example, one of the predetermined criteria can correspond to the estimated return journey time being greater than an expected typical trip time.

Aspects of the trip time analyzer <NUM> can be coupled with aspects of the return journey notification generator <NUM> such that return journey notifications can be generated and ultimately provided for display on a user computing device <NUM> (e.g., via display device <NUM>) when various criteria are met as determined by the trip time analyzer <NUM>. For example, a return journey notification can be generated and/or provided (e.g., from a server computing device <NUM> to the user computing device <NUM>) when comparing the estimated outbound journey time to the estimated return journey time results in a determination that one or more predetermined criteria are met as evaluated by the trip time analyzer <NUM>.

In some implementations, a notification provided by the return journey notification generator <NUM> can correspond to a warning icon provided on a user interface. In some implementations, a notification provided by the return journey notification generator <NUM> can correspond to an identification of the estimated return journey time. In some implementations, a notification provided by the return journey notification generator <NUM> can correspond to a time difference between the estimated outbound journey time and the estimated return journey time. In some implementations, a notification provided by the return journey notification generator <NUM> can correspond to a warning regarding expected traffic on the return journey route. It should be appreciated that other forms of warnings and/or textual advice can be provided via the return journey notification generator <NUM> (e.g., "Leave now to avoid traffic on the return journey.

In some implementations, a notification provided via the return journey notification generator <NUM> can correspond to a contextual explanation of how one or more of the estimated outbound journey time, the predicted return destination, the estimated destination time, and/or the estimated return journey time is determined. These contextual explanations can also be coupled with user interface features by which a user can change certain estimated assumptions to improve the accuracy of predicted aspects associated with a return journey route. More particularly, user interface features can be provided to receive instructions modifying at least one trip parameter (e.g., a predicted return destination, an estimated destination time, etc.).

In some implementations, a notification provided via the return journey notification generator <NUM> can include an alternate target destination than the target destination initially associated with a request for navigational directions. For example, if an alternate target destination (e.g., a second grocery store) has an estimated alternate outbound journey time and estimated alternate return journey time that is less than the estimated outbound journey time and the estimated return journey time associated with travel to a first grocery store, then a return journey notification can include a suggestion to select the alternate target destination. Alternate target destinations can be provided for display on a map or other user interface along with information including an estimated outbound journey time and estimated return journey time for the alternate target destination. In some implementations, alternate target destinations can be determined at least in part based on user location history (e.g., user location history <NUM>). By determining an alternate target destination that a given user has actually visited before, the mapping application can enhance the likelihood of determining desirable alternate target destinations for each user.

Server computing device <NUM> can be a system comprising a single or multiple computing devices that are remotely located relative to user computing device <NUM>. Server computing device <NUM> can include one or more processors <NUM> and at least one memory <NUM>. The one or more processors <NUM> can be any suitable processing device (e.g., a processor core, a microprocessor, an ASIC, a FPGA, a controller, a microcontroller, etc.) and can be one processor or a plurality of processors that are operatively connected. The memory <NUM> can include one or more non-transitory computer-readable storage mediums, such as RAM, ROM, EEPROM, EPROM, flash memory devices, magnetic disks, etc., and combinations thereof. The memory <NUM> can store data <NUM> and instructions <NUM> which are executed by the processor(s) <NUM> to cause the server computing device <NUM> to perform operations.

The server computing device <NUM> can also include a communications interface <NUM> that enables communications over one or more networks (e.g., network <NUM>), as well as a mapping application <NUM> and a mapping database <NUM>. The communications interface <NUM> of server computing device <NUM> can include similar features as described relative to communications interface <NUM> of user computing device <NUM>. Mapping application <NUM> of server computing device can also include the same features of mapping application <NUM> depicted relative to user computing device <NUM>, including an outbound journey route generator, return destination predictor, return journey route generator, trip time analyzer, and return journey notification generator.

In some implementations, one or more features of mapping application <NUM>/<NUM> including the outbound journey route generator, return destination predictor, return journey route generator, trip time analyzer, and return journey notification generator can be implemented using one or more machine-learned models. According to the invention, the return journey route is determined based at least in part on one or more operations performed by one or more machine-learned models. Such machine-learned models can be trained on a large corpus of training data including ground-truth samples that provide a framework for the models improve the accuracy of their inference capabilities. Example machine-learned models can include but are not limited to one or more neural networks (e.g., deep neural networks), support vector machines, decision trees, ensemble models, k-nearest neighbors models, Bayesian networks, or other types of models including linear models and/or non-linear models. Example neural networks can include feed-forward neural networks, convolutional neural networks, recurrent neural networks (e.g., long short-term memory (LSTM) recurrent neural networks, gated recurrent unit (GRU) neural networks), or other forms of neural networks.

Mapping database <NUM> can include various portions of data that can be accessed by mapping application <NUM> and utilized in determinations in accordance with the disclosed technology. For example, mapping database can include one or more of traffic information <NUM>, user location history <NUM>, and/or map information <NUM>.

Traffic information <NUM> can include information for use in determining current traffic conditions and/or historical traffic conditions. Traffic information can be defined relative to different road segments within a map. Each route segment can be associated with one or more geographical locations. A given route between locations can comprise a plurality of route segments. Route segments can be based on stretches of road between intersections, changes in road names, on turn instructions for the particular determined route, or any other useful method. For example, if a route between location A and location C requires a turn at location B, the route consists of two route segments, the segment A-B and the segment B-C.

Traffic information <NUM> can also include vehicle capacity index data for each road segment. For example, each route segment can be associated with a capacity index representing the capacity of the route segment relative to other route segments. The capacity index can describe how the speed of traffic along a particular route segment varies relative to other route segments depending on the volume of cars on the route segment at any given time. For example, a highway with two lanes can have roughly double the capacity index of a highway with one lane. This can indicate that the addition of a single vehicle on the two-lane highway would impact, for example, by slowing down the speed of traffic roughly half as much as the addition of a single vehicle on the one-lane highway. In another example, assuming that traffic lights are more efficient at moving traffic, an arterial road with a stop sign can have a lower capacity index than an arterial road with a traffic light. Thus, the capacity index is an attribute of the route segment and is independent of the number of cars on the road.

The examples described above are simplified examples demonstrating a linear capacity index assigned to each road. However, it will be understood that in a practical implementation the capacity index is likely to require sophisticated calculations to convert traffic volume to relative speed. In another example, the capacity index can change over time, for example, if the attributes of the route segment changed, such as the number of lanes, or if the timing of traffic signals changed.

The capacity index for a particular route segment can be determined based on observation of the particular route segment over time. For example, the capacity index can be determined by observing the impact on traffic speeds as additional people try to join traffic on a route segment, building a model for each route segment that correlates traffic speed with observed number of users driving on the road. Through such observation the capacity index can be used to predict the impact on traffic speeds for a particular route segment each time an additional vehicle enters or leaves the flow of traffic.

Traffic information <NUM> can also include vehicle volume data associated with each route segment. For example, vehicle volume data can include a table, database, or other arrangement of data which includes a current estimate of the number of vehicles expected to be on a particular route segment within a specified time period. Time periods can be defined as a time interval, for example, <NUM> minute or <NUM> minute periods into the future. The time period data can be updated continuously as the server computing device <NUM> sends and receives information. The table, capacity index, and vehicle volume data can be used to estimate the amount of time required for a vehicle to travel a road segment at some time in the future. Traffic information can additionally consider construction data, data identifying road closures, weather data or other factors that can affect traffic on one or more road segments.

User location history <NUM> can include a history of specific locations a user has been and/or routes a user has traveled based on location data (e.g., from geographic position component) and corresponding timestamps that are recorded by a user computing device <NUM> when authorized by a user to do so. User location history <NUM> can help determine one or more common journey patterns that can help determine a predicted return destination associated with a request for navigational directions to a specified target destination.

Map information <NUM> can include map data for use by a user computing device to display one or more maps, routes, turn-by-turn directions, and the like in accordance with aspects of the disclosed technology. For example, map information <NUM> can include map tiles, where each tile comprises a map image of a particular geographic area. A single tile can cover an entire region such as a state in relatively little detail and another tile can cover just a few streets in high detail. In that regard, a single geographic point can be associated with multiple tiles, and a tile can be selected for transmission based on a desired level of zoom. The map information <NUM> is not limited to any particular format. For example, the images can comprise street maps, satellite images, or a combination of these, and can be stored as vectors (particularly with respect to street maps) or bitmaps (particularly with respect to satellite images). Map tiles contained within map information <NUM> can be associated with various geographical locations such that server computing device <NUM> and/or user computing device <NUM> are capable of selecting, retrieving, transmitting, or displaying one or more tiles in response to receiving one or more geographical locations.

Mapping application <NUM>/<NUM> and map information <NUM> can process location information in many different forms, such as such as latitude/longitude positions, street addresses, street intersections, an x-y coordinate with respect to the edges of a map (such as a pixel position when a user clicks on a map), names of buildings and landmarks, and other information in other reference systems that is capable of identifying geographic locations (e.g., lot and block numbers on survey maps). Mapping application <NUM>/<NUM> can further translate locations from one reference system to another. For example, user computing device <NUM> can employ or access a geocoder to convert a location identified in accordance with one reference system (e.g., a street address such as "<NUM> Amphitheatre Parkway, Mountain View, CA" ) into a location identified in accordance with another reference system (e.g., a latitude/longitude coordinate such as (<NUM>°, <NUM>°). In that regard, it will be understood that exchanging or processing locations expressed in one reference system, such as street addresses, can also be received or processed in other reference systems as well.

Referring now to <FIG>, an example user interface <NUM> associated with a mapping application (e.g., mapping application <NUM>/<NUM> of <FIG>) is depicted. In the example of <FIG>, user interface <NUM> includes interactive text entry portions by which a user can specify an initial location <NUM> (e.g., Your current location) and/or a target destination <NUM> (e.g., Steven Lee Supermarket). User interface <NUM> can be configured to depict an outgoing journey route <NUM> from the initial location to the target destination and a return journey route <NUM> from the target destination to a return destination (which according to the invention corresponds to the initial location). User interface <NUM> can include an estimated outbound journey time <NUM> and an estimated outbound journey distance <NUM> associated with the outbound journey route <NUM>. User interface can also include one or more return journey notifications, for example, an estimated return journey time <NUM> and/or an estimated time difference <NUM> corresponding to a delay between the estimated outbound journey time <NUM> and estimated return journey time <NUM>. It should be appreciated that the user interface <NUM> of <FIG> is provided as an example only. Alternative user interfaces may not necessarily include a map and/or may include additional or alternative return journey notifications than those depicted in <FIG>.

Referring now to <FIG>, a communication schematic <NUM> for providing return journey notifications according to example embodiments of the present disclosure is depicted. Communications schematic <NUM> includes different signaling that can occur between a user computing device <NUM> and a server computing device <NUM> to implement return journey mapping communication. For example, signal <NUM> communicated from user computing device <NUM> to server computing device <NUM> can include a request for navigational directions to a target destination. Signal <NUM> can include at least a target destination and optionally an initial location when the initial location differs from a current location of user computing device <NUM>.

Signal <NUM> communicated from server computing device <NUM> to user computing device <NUM> can include an outbound journey route determined from an initial location to the target destination. Signal <NUM> can include an estimated outbound journey time associated with the outbound journey route. Signal <NUM> can also include a map and/or turn-by-turn directions associated with the outbound journey route.

Signal <NUM> communicated from server computing device <NUM> to user computing device <NUM> can include a return journey route determined from the target destination to a return destination. Signal <NUM> can include an estimated return journey time associated with the return journey route. Signal <NUM> can also include a map and/or turn-by-turn directions associated with the return journey route.

Signal <NUM> communicated from server computing device <NUM> to user computing device <NUM> can include one or more return journey notifications such as described herein. Although signals <NUM>, <NUM>, and <NUM> are illustrated in <FIG> as separate signals, it should be appreciated that the outbound journey, return journey and associated data including return journey notification(s) can be communicated in a single transmission from the server computing device <NUM> to user computing device <NUM>.

In some implementations, the one or more return journey notifications communicated via signal <NUM> can include a contextual explanation of how one or more of the estimated outbound journey time, the predicted return destination, the estimated destination time, and/or the estimated return journey time is determined. These contextual explanations can also be coupled with user interface features by which a user can change certain estimated assumptions to improve the accuracy of predicted aspects associated with a return journey route. More particularly, user interface features can be provided to receive instructions modifying at least one trip parameter (e.g., a predicted return destination, an estimated destination time, etc.). These instructions can then be provided via signal <NUM> from user computing device <NUM> back to server computing device <NUM>. In response, adjusted return journey notifications (and optional adjusted outbound journey route and/or return journey route) can be provided via signal <NUM> from server computing device <NUM> to user computing device <NUM>.

<FIG> depicts a flowchart of a first example method <NUM> according to example embodiments of the present disclosure.

At <NUM>, one or more computing devices (e.g., one or more user computing devices and/or one or more server computing devices) can obtain a request for navigational directions to a target destination. In some implementations, the target destination is provided by instructions received as user input (e.g., to a user computing device).

At <NUM>, the one or more computing devices can determine an outbound journey route from an initial location to the target destination, wherein the outbound journey route includes an estimated outbound journey time. In some implementations, determining the estimated outbound journey time at <NUM> is based at least in part on one or more of current traffic conditions or historical traffic conditions.

At <NUM>, the one or more computing devices can determine a predicted return destination. In some implementations, determining the return destination at <NUM> can be determined based on input received from a user computing device from which the request for navigational directions is received at <NUM>. In some implementations, determining the return destination at <NUM> can be based on a current location associated with a user computing device from which the request for navigational directions is received at <NUM>. In some implementations, determining the return destination at <NUM> can be based on a history of previously visited locations associated with a user computing device from which the request for navigational directions is received.

At <NUM>, the one or more computing devices can determine an estimated destination time indicative of an estimated amount of time a user will spend at the target destination. In some implementations, the estimated destination time determined at <NUM> can be based an average amount of time multiple users spend at the target destination. In some implementations, the estimated destination time determined at <NUM> can be based on an average amount of time the user spends at the target destination. The estimated destination time determined at <NUM> as well as the estimated outbound journey time determined at <NUM> can be used together to help determine a return start time for determining an estimated return journey time.

More particularly, at <NUM>, the one or more computing devices can determine a return journey route from the target destination to a return destination, wherein the return destination is the initial location, and wherein the return journey route includes an estimated return journey time. In some implementations, determining the estimated return journey time at <NUM> is based at least in part on one or more of current traffic conditions or historical traffic conditions.

At <NUM>, the one or more computing devices can compare the estimated outbound journey time to the estimated return journey time. At <NUM>, the one or more computing devices can generate a notification regarding the return journey route when comparing the estimated outbound journey time to the estimated return journey time at <NUM> results in identification that one or more predetermined criteria are met. In some implementations, the notification generated at <NUM> can include an identification of the estimated return journey time. In some implementations, the notification generated at <NUM> can include a time difference between the estimated outbound journey time and the estimated return journey time. In some implementations, the notification generated at <NUM> can include a warning regarding expected traffic on the return journey route. In some implementations, the notification generated at <NUM> can include a contextual explanation of how one or more of the estimated outbound journey time, the estimated destination time, or the estimated return journey time is determined. In some implementations, the notification generated at <NUM> can include an alternate target destination. In such instance, method <NUM> can also include determining an alternate target destination having an estimated alternate outbound journey time and estimated alternate return journey time that is less than the estimated outbound journey time determined at <NUM> and the estimated return journey time determined at <NUM>.

At <NUM>, the one or more computing devices can provide for display, the one or more return journey notifications generated at <NUM>. For example, the one or more return journey notifications can be provided for display on a display device associated with a user computing device.

At <NUM>, the one or more computing devices can provide for display, a map depicting the outbound journey route and the return journey route, optionally including turn-by-turn directions for the outbound journey route and the return journey route. In some implementations, the return journey notifications provided for display at <NUM> can be a part of the map and/or directions provided for display at <NUM>.

<FIG> depicts a flowchart of a second example method <NUM> according to example embodiments of the present disclosure. In some implementations, method <NUM> is implemented by one or more processors of a user computing device such as user computing device <NUM> of <FIG>.

At <NUM>, a user computing device can receive a request for navigational directions to a target destination. In some implementations, the request for navigational directions received at <NUM> can be provided as instructions via a user input device (e.g., a touchscreen, a keyboard, etc.).

At <NUM>, the user computing device can initiate determination of an estimated outbound journey time to travel from an initial location to the target destination and an estimated return journey time to travel from the target destination to a return destination. In some implementations, a user computing device initiates determination of such routes, but the actual determination is implemented by a server computing device, one or more aspects of which can be returned to the user computing device. In some implementations, the estimated outbound journey time and the estimated return journey time can be determined at least in part from one or more of current traffic conditions or historical traffic conditions.

At <NUM>, the user computing device can receive a notification regarding the return journey time when a comparison of the estimated outbound journey time to the estimated return journey time results in a determination that one or more predetermined criteria are met.

At <NUM>, the user computing device can provide the notification received at <NUM> for display on a display device associated with the user computing device. At <NUM>, a map depicting the outbound journey route and/or return journey route can also be provided for display. In some implementations, the notification regarding the return journey time provided for display at <NUM> can be part of the map provided for display at <NUM>.

Claim 1:
A computer-implemented method, comprising:
obtaining (<NUM>), by one or more computing devices (<NUM>), a request for navigational directions to a target destination;
determining (<NUM>), by the one or more computing devices (<NUM>), an outbound journey route from an initial location to the target destination, wherein the outbound journey route comprises an estimated outbound journey time;
determining (<NUM>), by the one or more computing devices (<NUM>), a return journey route based at least in part on one or more operations performed by one or more machine-learned models, wherein the return journey route comprises a route from the target destination to a return destination wherein the return destination is the initial location, and wherein the return journey route comprises an estimated return journey time;
comparing (<NUM>), by the one or more computing devices (<NUM>), the estimated outbound journey time to the estimated return journey time; and
generating (<NUM>), by the one or more computing devices (<NUM>), a notification regarding the return journey route when comparing the estimated outbound journey time to the estimated return journey time results in a determination that the estimated return journey time is greater than the estimated outbound journey time, wherein the notification regarding the return journey route comprises a time difference between the estimated outbound journey time and the estimated return journey time.