A computer-implemented method for generating traffic density guidance information in an inventory system for moving items in a warehouse using robots, comprising: by a computing system under control of specific computer-executable instructions, receiving route information for the robots operating within a physical area, the route information identifying a path each robot is scheduled to traverse within the physical area, wherein the physical area includes a set of sectors, for sectors included in the set of the sectors, generating a traffic density value based at least in part on a number of times a path for a robot enters the respective sector; generating a density map for the physical area, wherein each sector in the density map is assigned a color based at least in part on the traffic density value; and transmitting the density map to a communication device for providing a perceivable guide for humans to use when navigating from a current location of the communication device to a destination location of the communication device in the physical area; wherein the step of generating the density map further comprises: identifying, from the current location of the communication device to the destination location of the communication device, a sequence of sectors having the lowest traffic density values; suggesting a route from the current location of the communication device to the destination location of the communication device based on the identified sequence of sectors comprised by the density map. by a computing system under control of specific computer-executable instructions, receiving route information for the robots operating within a physical area, the route information identifying a path each robot is scheduled to traverse within the physical area, wherein the physical area includes a set of sectors, for sectors included in the set of the sectors, generating a traffic density value based at least in part on a number of times a path for a robot enters the respective sector; generating a density map for the physical area, wherein each sector in the density map is assigned a color based at least in part on the traffic density value; and transmitting the density map to a communication device for providing a perceivable guide for humans to use when navigating from a current location of the communication device to a destination location of the communication device in the physical area; wherein the step of generating the density map further comprises: identifying, from the current location of the communication device to the destination location of the communication device, a sequence of sectors having the lowest traffic density values; suggesting a route from the current location of the communication device to the destination location of the communication device based on the identified sequence of sectors comprised by the density map. identifying, from the current location of the communication device to the destination location of the communication device, a sequence of sectors having the lowest traffic density values; suggesting a route from the current location of the communication device to the destination location of the communication device based on the identified sequence of sectors comprised by the density map.