Avoid Crash - Traffic light

Avoid terrible crash. Control this madness, Help !!

In this simple game you will try to control trafic lights to avoid crash between cars. You have to switch lights properly to get the highest efectivness. Remember- the less car is waiting for a green light, the more points you will obtain. Feel yourself like a cop or traffic controler standing on the dangerous crossroads. Try to finish all levels with a gold medal. Good luck.