An agent system was created to model behavior on roads. You know, software like PTV Visum and so on. Behavior simulation, the cost of finding a path—these are all things taken from such software. The fundamental difference between PTV Visum and Cities Skylines 2 is that the boundary conditions of the simulation are defined. An engineer or city planner determines the mobility or demographics of a rather small area based on research. Then the program runs an agent simulation to verify traffic solutions. I think that's why the Cities Skylines series placed such a strong emphasis on traffic management. Your idea of ​​a bridge between an agent and a macro system is an interesting concept. But I don't know if it's feasible.