Hamed Araab

Lane directions and speed limits across an urban network are now set jointly at every decision step by one transformer shared by all road controllers, passed through a check grounded in graph orientation theory that keeps every junction mutually reachable at all times. On a grid with commuter rush hours, the learned policy makes about two thirds of roads one-way in the peak direction and cuts daily delay by roughly 80% against holding the initial two-way configuration all day, and by roughly 70% against a tuned two-way load balancer. Restricted to two-way roads at test time, it gains only about as much as that balancer, and its learned speed limits add delay.

Lane directions and speed limits across an urban network are now set jointly at every decision step by one transformer shared by all road controllers, passed through a check grounded in graph orientation theory that keeps every junction mutually reachable at all times. On a grid with commuter rush hours, the learned policy makes about two thirds of roads one-way in the peak direction and cuts daily delay by roughly 80% against holding the initial two-way configuration all day, and by roughly 70% against a tuned two-way load balancer. Restricted to two-way roads at test time, it gains only about as much as that balancer, and its learned speed limits add delay.