Road signs in the United States

In the United States, road signs are, for the most part, standardized by federal regulations, most notably in the *Manual on Uniform Traffic Control Devices* (MUTCD) and its companion volume the *Standard Highway Signs* (SHS).
## Regulatory signs 
Regulatory signs give instructions to motorists, pedestrians, and cyclists. Signs including Stop, Yield, No Turns, No Trucks, No Parking, No Stopping, Minimum Speed, Right Turn Only, Do Not Enter, Weight Limit, and Speed Limit are considered regulatory signs. Some have special shapes, such as the octagon for the Stop sign and the crossbuck for railroad crossings. Some signs can be localized, such as No Parking, and some are found only in state and local jurisdictions, as they are based on state or local laws, such as New York City's "Don't Block the Box" signs. These signs are in the R series of signs in the MUTCD and typically in the R series in most state supplements or state MUTCDs.

### R1 series: Stop and yield 
The MUTCD's R1 series is for Stop and Yield. As not all situations are covered, several states have their own standards in addition to the MUTCD. The 4-WAY and 3-WAY plaques (R1-3) were deprecated in the 2009 Edition of the MUTCD in favor of the ALL WAY plaque (R1-3P).

File:MUTCD R1-1.svg|R1-1Stop
File:MUTCD R1-2.svg|R1-2Yield
File:MUTCD R1-2aP.svg|R1-2aPTo oncoming traffic (plaque)
File:MUTCD R1-4.svg|R1-3PAll way (plaque)
File:MUTCD R1-5L.svg|R1-5Yield here to pedestrians
File:MUTCD R1-5aL (2003–2023).svg|R1-5aYield here to pedestrians
File:MUTCD R1-5bL.svg|R1-5bStop here for pedestrians
File:MUTCD R1-5cL (2003–2023).svg|R1-5cStop here for pedestrians
File:MUTCD R1-6 (yellow).svg|R1-6In-street pedestrian crossing
File:MUTCD R1-6a (yellow).svg|R1-6aIn-street pedestrian crossing
File:MUTCD R1-6b.svg|R1-6bIn-street school crossing
File:MUTCD R1-6b (within crosswalk).svg|R1-6bIn-street school crossing (within crosswalk)
File:MUTCD R1-6c.svg|R1-6cIn-street school crossing
File:MUTCD R1-7.svg|R1-7Wait on stop
File:MUTCD R1-8.svg|R1-8Go on slow
File:MUTCD R1-9.svg|R1-9Overhead pedestrian crossing
File:MUTCD R1-9a.svg|R1-9aOverhead pedestrian crossing
File:MUTCD R1-10P.svg|R1-10PExcept right turn (plaque)

### R2 series: Speed limit 
The MUTCD's R2 series is for speed limit signs. Some state supplements and state MUTCDs place various speed limit signs in other series. As all situations are not covered, several states have their own standards in addition to the MUTCD. Speed limits in the United States are always in miles per hour. Metric speed limit signs in kilometers per hour used to be authorized but extremely rare, usually seen near the borders with Canada and Mexico, both of which use the metric system. They have been discontinued as of 2012. Many states, however, disallow the use of metric signs on state-maintained roads due to MUTCD restrictions, increasing the rarity of such signs.

File:MUTCD R2-1.svg|R2-1Speed limit
File:MUTCD R2-1 METRIC.svg|R2-1Speed limit (metric)
File:MUTCD R2-2.svg|R2-2PTruck speed limit (plaque)
File:MUTCD R2-2 METRIC.svg|R2-2PTruck speed limit (metric)
File:MUTCD R2-3.svg|R2-3PNight speed limit (plaque)
File:MUTCD R2-3 METRIC.svg|R2-3PNight speed limit (metric)
File:MUTCD R2-4.svg|R2-4PMinimum speed limit (plaque)
File:MUTCD R2-4 METRIC.svg|R2-4PMinimum speed limit (metric)
File:Speed Limit 55 Minimum 30 sign.svg|R2-4aCombined speed limit
File:MUTCD R2-5P.svg|R2-5PUnless otherwise posted (plaque)
File:MUTCD R2-6bP.svg|R2-6bP$XX fine (plaque)
File:MUTCD R2-10.svg|R2-10Begin higher/double fines
File:MUTCD R2-11.svg|R2-11End double/higher fines

### R3 series: Lane usage and turns 
The MUTCD's R3 series of signs is for lane usage and turn signs. As all situations are not covered, several states have their own standards in addition to the MUTCD.

File:MUTCD R3-1.svg|R3-1No right turn
File:MUTCD R3-1a.svg|R3-1aNo right turn across tracks
File:MUTCD R3-2.svg|R3-2No left turn
File:MUTCD R3-2a.svg|R3-2aNo left turn across tracks
File:MUTCD R3-3.svg|R3-3No turns
File:MUTCD R3-4.svg|R3-4No U-turn
File:MUTCD R3-5L.svg|R3-5LLeft turn only
File:MUTCD R3-5R.svg|R3-5RRight turn only
File:MUTCD R3-5a.svg|R3-5aStraight through only
File:MUTCD R3-5b.svg|R3-5bLeft lane (plaque)
File:MUTCD R3-5e.svg|R3-5eCenter lane (plaque)
File:MUTCD R3-5f.svg|R3-5fRight lane (plaque)
File:MUTCD R3-5g.svg|R3-5gBus lane (plaque)
File:MUTCD R3-6L.svg|R3-6LOptional movement lane control, straight through and left turn
File:MUTCD R3-6R.svg|R3-6ROptional movement lane control, straight through and right turn
File:MUTCD R3-7L.svg|R3-7LLeft lane must turn left
File:MUTCD R3-7R.svg|R3-7RRight lane must turn right
File:MUTCD R3-8.svg|R3-8Advance intersection lane control (two lanes)
File:MUTCD R3-8a.svg|R3-8aAdvance intersection lane control (three lanes)
File:MUTCD R3-8b.svg|R3-8bAdvance intersection lane control (three lanes)
File:MUTCD R3-9a.svg|R3-9aTwo-way left turn only (overhead)
File:MUTCD R3-9b.svg|R3-9bTwo-way left turn only (post-mounted)
File:MUTCD R3-9e.svg|R3-9eReversible lane control (overhead)
File:MUTCD R3-9f.svg|R3-9fReversible lane control (post-mounted)
File:MUTCD R3-9g.svg|R3-9gAdvance reversible lane control transition
File:MUTCD R3-9h.svg|R3-9hAdvance reversible lane control transition
File:MUTCD R3-9i.svg|R3-9iEnd reverse lane
File:MUTCD R3-10.svg|R3-10Preferential lane vehicle occupancy definition (post-mounted)
File:MUTCD R3-10a.svg|R3-10aPreferential lane vehicle occupancy definition (post-mounted)
File:MUTCD R3-11.svg|R3-11Preferential lane operation, high-occupancy vehicles (post-mounted) 
File:MUTCD R3-11a.svg|R3-11aPreferential lane operation, high-occupancy vehicles (post-mounted)
File:MUTCD R3-11d.svg|R3-11dPreferential lane operation (post-mounted)
File:MUTCD R3-11b.svg|R3-11bPreferential lane operation, high-occupancy vehicles, full-time (post-mounted)
File:MUTCD R3-12.svg|R3-12Preferential lane ahead, high-occupancy vehicles (post-mounted)
File:MUTCD R3-12a.svg|R3-12aPreferential lane ends, high-occupancy vehicles (post-mounted)
File:MUTCD R3-12b.svg|R3-12Preferential lane ends, high-occupancy vehicles (post-mounted)
File:MUTCD R3-13.svg|R3-13Preferential lane vehicle occupancy definition (overhead)
File:MUTCD R3-13a.svg|R3-13aPreferential lane vehicle occupancy definition (overhead)
File:MUTCD R3-14.svg|R3-14HOV lane operation (overhead)
File:MUTCD R3-14a.svg|R3-14aHOV lane operation (overhead)
File:MUTCD R3-14b.svg|R3-14bHOV lane operation (overhead)
File:MUTCD R3-15.svg|R3-15HOV lane ahead (overhead)
File:MUTCD R3-15a.svg|R3-15aHOV lane begins XX miles (overhead)
File:MUTCD R3-17.svg|R3-17Bike lane
File:MUTCD R3-18.svg|R3-18No U or left turn
File:MUTCD R3-23.svg|R3-23All turns from right lane (used at jughandles)
File:MUTCD R3-24.svg|R3-24All turns (diagonal right arrow) (used at jughandles)
File:MUTCD R3-24a.svg|R3-24aU and left turns (diagonal right arrow) (used at jughandles)
File:MUTCD R3-27.svg|R3-27No straight through
File:MUTCD R3-29P.svg|R3-29PPay toll (plaque)
File:MUTCD R3-33R.svg|R3-33RRight lane must exit

### R4 series: Regulation of movement 
The MUTCD's R4 series of signs is for the regulation of movement signs. As all situations are not covered, several states have their own standards in addition to the MUTCD.

File:MUTCD R4-1.svg|R4-1Do not pass
File:MUTCD R4-2.svg|R4-2Pass with care
File:MUTCD R4-3.svg|R4-3Slower traffic keep right
File:MUTCD R4-4.svg|R4-4Begin right turn lane yield to bikes
File:MUTCD R4-5.svg|R4-5Trucks use right lane
File:MUTCD R4-6.svg|R4-6Truck lane 500 feet
File:MUTCD R4-7.svg|R4-7Keep right
File:MUTCD R4-7a.svg|R4-7aKeep right
File:MUTCD R4-7b.svg|R4-7bKeep right
File:MUTCD R4-7c.svg|R4-7cKeep right of obstacle
File:MUTCD R4-8.svg|R4-8Keep left
File:MUTCD R4-8a.svg|R4-8aKeep left
File:MUTCD R4-8b.svg|R4-8bKeep left
File:MUTCD R4-8c.svg|R4-8cKeep left of obstacle
File:MUTCD R4-9.svg|R4-9Stay in lane
File:MUTCD R4-10.svg|R4-10Runaway vehicles only
File:MUTCD R4-11.svg|R4-11Cyclists may use full lane
File:MUTCD R4-12.svg|R4-12Slow vehicles with five or more following vehicles must use turn-out
File:MUTCD R4-13.svg|R4-13Slow vehicles must use turn-out ahead
File:MUTCD R4-14.svg|R4-14Slow vehicles must turn out
File:MUTCD R4-16.svg|R4-16Keep right except to pass
File:MUTCD R4-17.svg|R4-17Do not drive on shoulder
File:MUTCD R4-18.svg|R4-18Do not pass on shoulder

### R5 series: Exclusionary 
The MUTCD's R5 series of signs is for exclusionary signs. As all situations are not covered, several states have their own standards in addition to the MUTCD. The most common of these signs is the do not enter sign.

File:MUTCD R5-1.svg|R5-1Do not enter
File:MUTCD R5-1a.svg|R5-1aWrong way
File:MUTCD R5-1b.svg|R5-1bWrong way for bicycles
File:MUTCD R5-2.svg|R5-2No trucks
File:MUTCD R5-3.svg|R5-3No motorized vehicles
File:MUTCD R5-4.svg|R5-4No commercial vehicles
File:MUTCD R5-5.svg|R5-5No lugged vehicles
File:MUTCD R5-6.svg|R5-6No bicycles
File:MUTCD R5-7.svg|R5-7No non-motorized traffic
File:MUTCD R5-8.svg|R5-8No motor driven cycles
File:MUTCD R5-10.svg|R5-10No pedestrians, bicycles or motor driven cycles
File:MUTCD R5-10a.svg|R5-10aNo pedestrians, bicycles or motor driven cycles on freeway
File:MUTCD R5-10b.svg|R5-10bNo pedestrians or bicycles
File:MUTCD R5-10c.svg|R5-10cNo pedestrians
File:MUTCD R5-11.svg|R5-11No unauthorized vehicles

### R6 series: One way and divided highway 
The MUTCD's R6 series of signs is for one way and divided highway signs. As all situations are not covered, several states have their own standards in addition to the MUTCD. The most common of these signs is the One Way sign.

File:MUTCD R6-1R.svg|R6-1ROne way (right)
File:MUTCD R6-1L.svg|R6-1LOne way (left)
File:MUTCD R6-2R.svg|R6-2ROne way (with arrow) (right)
File:MUTCD R6-2L.svg|R6-LOne way (with arrow) (left)
File:MUTCD R6-3.svg|R6-3Divided highway crossing
File:MUTCD R6-3a.svg|R6-3aDivided highway crossing, T-intersection
File:MUTCD R6-4.svg|R6-4Chevron roundabout directional
File:MUTCD R6-4a.svg|R6-4aChevron roundabout (three chevrons)
File:MUTCD R6-4b.svg|R6-4bChevron roundabout (four chevrons)
File:MUTCD R6-5P.svg|R6-5PRoundabout circulation (plaque)
File:MUTCD R6-6.svg|R6-6Begin one way
File:MUTCD R6-7.svg|R6-7End one way

### R7 series: Parking 
The MUTCD allows for three types of parking signs: permissive, No Parking, and No Standing. However, in most states, there is an additional more restrictive one, No Stopping. These signs are found in the R7 series of signs in the MUTCD. As all situations are not covered, several states and local governments have their own standards in addition to the MUTCD.  Permissive parking signs allow for parking for either an unlimited or varied amount of time. They are often used in conjunction with parking meters and parking permits. They are specified by the MUTCD to be green on white. Local variations occur with additional information and slightly different designs.  No Parking signs indicate that loading or unloading while temporarily stopped is permitted, but the driver must not leave the vicinity of the vehicle. Some No Parking signs display time restrictions, while others are permanent restrictions. There are also temporary versions of the signs, often of similar design to the permanent ones. These signs are specified by the MUTCD to be red on white, although local variations occur.  No Standing signs indicate that stopping temporarily to load or unload passengers is allowed, but vehicles cannot be stopped at the location for longer periods of time, even if the driver remains with the vehicle. As not all situations are covered, several states have their own standards in addition to the MUTCD.

File:MUTCD W11-1.svg|W11-1Bicycle
File:MUTCD W11-2.svg|W11-2Pedestrians
File:MUTCD W11-3.svg|W11-3Deer
File:MUTCD W11-4.svg|W11-4Cattle
File:MUTCD W11-5.svg|W11-5Farm vehicles
File:MUTCD W11-6.svg|W11-6Snowmobile
File:MUTCD W11-7.svg|W11-7Equestrian
File:MUTCD W11-8.svg|W11-8Emergency vehicle
File:MUTCD W11-9.svg|W11-9Handicapped
File:MUTCD W11-10.svg|W11-10Truck
File:MUTCD W11-11.svg|W11-11Golf cart
File:MUTCD W11-14.svg|W11-14Horse-drawn vehicles
File:MUTCD W11-15.svg|W11-15Bicycle and pedestrians
File:MUTCD W11-16.svg|W11-16Bear
File:MUTCD W11-17.svg|W11-17Sheep
File:MUTCD W11-18.svg|W11-18Ram
File:MUTCD W11-19.svg|W11-19Donkey
File:MUTCD W11-20.svg|W11-20Elk
File:MUTCD W11-21.svg|W11-21Moose
File:MUTCD W11-22.svg|W11-22Wild horse

### W12 series: Low Clearance Warnings 
The MUTCD's W12 series of signs is for warning signs relating to low clearance. Metric low bridge signs in meters used to be authorized but extremely rare, usually seen near the borders with Canada and Mexico, both of which use the metric system. (and should indicate center lane exit).

### Interchange signs 

File:Advance Guide Sign E1-3 (up to new standards).png|Interchange Advance Guide Sign
File:MUTCD E6-1a.svg|E6-1aPull-through sign

File:MUTCD E5-1a.svg|E5-1aExit number sign
File:MUTCD E5-1.svg|E5-1Exit sign
File:MUTCD Sign Assembly - E5-1a with E13-1P.svg|E5-1a and E13-1PExit number sign with speed advisory
File:MUTCD D2-3.svg|D2-3Mileage signs for highway routes
File:Exit Direction Sign.png|Interchange Exit Direction Sign

File:Logo Sign.svg|Specific service signs for food (as shown)
File:MUTCD D5-1.svg|D5-1Rest area (needs to be updated to 2012 SHSM standards)
File:MUTCD D5-12.svg|D5-12Interstate oasis
File:MUTCD D9-18.svg|D9-18Advanced services sign

### Toll signs 
Chapter 2F of the MUTCD deals with signs relating to tolls.

File:MUTCD R3-44.svg|R3-44Toll road pass only
File:MUTCD R3-44a.svg|R3-44aToll road pass or high-occupancy vehicle&nbsp;(HOV)
File:MUTCD R3-48.svg|R3-48Toll costs on express lane
File:MUTCD R3-48a.svg|R3-48aToll costs on express lane or HOV
File:Conventional Toll Plaza Advance Sign 1.svg|MUTCD conventional toll plaza advance sign
File:Conventional Toll Plaza Advance Sign 2.svg|MUTCD conventional toll plaza advance sign
File:MUTCD R3-29P.svg|R3-29PPay toll
File:MUTCD R3-31.svg|R3-31Electronic toll collection pass only
File:MUTCD-PR R2-3.svg|R2-3Toll late speed limit (Puerto Rico, Spanish)
File:MUTCD R3-30P.svg|R3-30PTake ticket
File:MUTCD R3-28.svg|R3-28Toll pricing

### Motorist services 

File:MUTCD D9-1.svg|D9-1Telephone
File:MUTCD D9-2.svg|D9-2Hospital
File:MUTCD D9-3.svg|D9-3Camping
File:MUTCD D9-3a.svg|D9-3aTrailer camping
File:MUTCD D9-4.svg|D9-4Litter container
File:MUTCD D9-6.svg|D9-6Handicapped accessible
File:MUTCD D9-7.svg|D9-7Gas
File:MUTCD D9-8.svg|D9-8Food
MUTCD RM-050.svg|RM-050Food
File:MUTCD D9-9.svg|D9-9Lodging
File:MUTCD D9-10.svg|D9-10General information
File:MUTCD D9-11.svg|D9-11Diesel fuel
File:MUTCD D9-11a.svg|D9-11aAlternative fuel (CNG)
File:MUTCD D9-11b.svg|D9-11bElectric vehicle charging
File:MUTCD D9-11c.svg|D9-11cAlternative fuel (E85)
File:MUTCD D9-12.svg|D9-12RV sanitary station
File:MUTCD D9-13.svg|D9-13Ambulance symbol
File:MUTCD D9-14.svg|D9-14Police
File:MUTCD D9-15.svg|D9-15Propane gas
File:MUTCD D9-16.svg|D9-16Truck parking
File:MUTCD D9-20.svg|D9-20Pharmacy
File:MUTCD D9-21.svg|D9-21Telecommunication&nbsp;(TDD/TYY)
File:MUTCD D9-22.svg|D9-22Wireless internet

### General information 

File:MUTCD I1-1.svg|I1-1Traffic signal speed
File:MUTCD I2-1.svg|I2-1State line
File:MUTCD I2-2.svg|I2-2River
File:MUTCD I3-5.svg|I3-5Airport
File:MUTCD I-6.svg|I3-6Bus station
File:MUTCD I-7.svg|I3-7Train station
File:MUTCD I4-1.svg|I4-1Library
File:MUTCD I-11.svg|I-11Recycling collection center
File:MUTCD I3-8.svg|I3-8Light rail station

## School zone signs 
The S series of signs are specially designated by the MUTCD for use around schools. Some states have additional school warning-related signs in the S series, the W series of warning signs, and/or the R series of regulatory signs of the state supplement or state MUTCD. The adoption of the 2009 MUTCD required school warning signs to have fluorescent yellow-green backgrounds.

File:MUTCD S1-1.svg|S1-1School zone ahead (also used for pedestrian crosswalks near schools) since 1998
File:MUTCD S1-1 (old).svg|S1-1School (1971–2009)
File:MUTCD S3-1 (new).svg|S3-1School bus stop ahead
File:MUTCD S3-1 (old).svg|S3-1School bus stop ahead (1971–2009)
File:MUTCD S3-1 (old) fluorescent.svg|S3-1  School bus stop ahead (1998–2009)
File:MUTCD S3-2.svg|S3-2School bus turn ahead
File:MUTCD S4-1P.svg|S4-1PTime of Day
File:MUTCD S4-2P.svg|S4-2PWhen children are present
File:MUTCD S4-3P.svg|S4-3PSchool plaque
File:MUTCD S4-4P.svg|S4-4PWhen lights flashing
File:MUTCD S4-5.svg|S4-5School speed limit ahead
File:MUTCD S4-5a.svg|S4-5aSchool Speed zone ahead
File:MUTCD S4-6P.svg|S4-6PDay(s) of the week
File:MUTCD S4-7P.svg|S4-7PAll year school zone ahead
File:MUTCD S5-1.svg|S5-1School speed limit when flashing
File:MUTCD S5-2.svg|S5-2End school zone (usually under an R2 speed limit sign)
File:MUTCD S5-3.svg|S5-3End of school speed limit

## Notes 
## References 
## Other websites 
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