What tools for traffic flow modeling do you know?

Question

Unity

It is required to simulate a traffic flow, or an intersection, or a transition in the subway.
What means would you recommend? I know about anylogic, with it you can easily do this.
I also found such a template on unity https://www.assetstore.unity3d.com/en/#!/content/40764
Who dealt with a similar issue? I lean more towards the approach of buying a template on unity, tk. I see more opportunities for expansion in the future, for example, if you develop it into a tool, then you can cut your mathematics into traffic lights or objects, make integration with 2gis for example, etc.)