Rush Hour: Transit

The city center is constantly a lot of cars, especially during the hours of peak hour. But you are a regulator movement must create non-stop, all cars moving in transit. This can be done only showing the logic and controlling the traffic lights right. Some cars on the track can break, thus creating traffic congestion. Send the robot to the broken car, until the motion is on the other road. As soon will repair immediately open the movement, otherwise the machine face.