1) There are different choices you can make about simulating individual agents or aggregate flows along roads. Assuming you're interested in the former, you can

1) There are different choices you can make about simulating individual agents or aggregate flows along roads. Assuming you're interested in the former, you can advance the simulation in discrete time-steps using approaches like the intelligent driver model mentioned in another thread. Chapter 4 of https://apps.cs.utexas.edu/tech_reports/reports/tr/TR-2157.pdf https://apps.cs.utexas.edu/tech_reports/reports/tr/TR-2157.p... is a different approach to the discrete time system that tries to handle complications that come up when applying to OpenStreetMap, like having a vehicle cross multiple roads and intersections in a single 0.1 second timestep, due to really short roads. If you're willing to throw away detailed movement (including acceleration and lane-changing), you can try a discrete-event approach, where you say "this vehicle enters one end of a road at time t, don't calculate anything for it until t + best_case_time_to_cross". https://dabreegster.github.io/abstreet/trafficsim/index.html https://dabreegster.github.io/abstreet/trafficsim/index.html has some ideas there. 2) Another option with much less detailed traffic simulation, but much more UI focus, is abstreet.org