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Car drivers' sight often be obstructed by the front truck (or bus), which is large-size. They can not see the traffic lights timely，so car drivers violate traffic rules reluctantly and unwittingly. Due to this kind of vision limitation, car driver have to slam emergency brake when seeing the red light suddenly，sometime，which causes rear-end.Now,car drivers will be able to see the traffic-ground-lights on the floor，the ones settled on the traffic painting line and show the signal synchronously. The traffic-ground-lights let them could determine the next operation timely to reduce red light running or rear-end events.