Further Research on Yellow Signal Problems at Signalized Intersection

judgment of the first administrative contentious case about yellow-light running shows that there is no uniform design method for yellow signal,which causes lots of confusions in traffic operation and enforcement in China.A questionnaire investigation on drivers' understanding and suggestions about yellow signal is carried out.The yellow signal's original background,meaning and function,length calculation and impact on intersection traffic safety are discussed.The function and the length calculation of yellow signal and all-red time are determined.It is suggested that a regulation about yellow signal in the current traffic regulation should be modified as The on-set of yellow signal means that the light is going to change to red immediately,and the vehicles approaching the stop-line should stop if they can do so safely,or go across the stop-line before red light starts.Meanwhile,the over-speeding snapping function during yellow signal is suggested in order to reduce the occurrence of over-speeding phenomenon during signal transition.