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 . <EOS>