If there is a short yellow, my wife accelerates, if it is a long yellow, she slams on the brakes. The Germans are very engineering minded. A "double" yellow, just means they have to think about what to do next instead of driving around mindlesly. If every one accelerated on a yellow though, yellow would remind those stopped to wait for all the accelerating vehicles to leave the area. Normally if one was stopped, they should make sure the traffic cleared before moving again any ways. What gets me, is the flashing red light. If it is clear and I have to wait to stop, by the time I get started again the traffic is in my way. I just go because it is clear. The worse thing that you want in traffic is for people to hesitate and disrupt the flow.