Plan, create and build roads, intersections and junctions and test the car traffic above. The system detects automatically which kind of intersection is needed. Afterwards put as many cars as you like onto the roads in order to create traffic. Avoid traffic jams. The road network can be modified also while the traffic is ongoing. The cars detect autonomous where they can drive and where not. Observe, how you can avoid traffic jams, or how you can cause it. You can ZOOM into the street network