one+ Traffic Light / Traffic Light

Traditional traffic light is not working well for some special cars. such as ambulance .
"One plus" traffic light is base on traditional traffic light ,and add a new function to help those special cars. for example, before the ambulance cross the crossroads, it will send a signal to the "ONE plus", and the "One plus" on ambulance's side will light green. An icon of ambulance will appear in the "One plus" traffic light to remind other cars. "One plus" traffic light is not only useful for the ambulance but also benefit for those special cars like police cars, firetruck and so on.