Wang Jinmei,Wang Zhao'an,Deng Wen
(School of Electrical Engineering,Xi'an Jiaotong University,Xi'an 710049,China)
Abstract:Timing of yellow interval,dilemma zone and the duration of enforcement are discussed£®It stresses that the existence of dilemma zone mostly comes down to selection of the yellow interval and assumptions of correlative factors£®With this understanding£¬a narrative description and mathematical derivation how to calculate yellow time are proposed£®For a driver approaching intersection at forthcoming yellow signal£¬he must try to achieve the standard reaction time and deceleration rate£¬and decides to stop or continue£®The dilemma occurs once he cannot make an appropriate choice£® The illustration of optional zone and dilemma zone is given£ºwhen a driver¡¯s distance from stop line is longer than the minimum distance that is required for a driver to stop£¬he is at optional zone£®On the contrary£¬he is at dilemma zone£®Based on the analysis£¬the existence of dilemma zone is regarded as an important factor£¬which causes inadvertent red light violation for drivers£®The computing formula about relevant inadvertent red light violation time and the length of dilemma zone are also gained£®In sight of this research£¬the consideration of a minimum enforcement tolerance for photographing red light running is suggested£¬especially aimed at traffic actuality at urban intersection in Xi'an£¬China£®
Keywords:red light running;yellow interval;option zone;dilemma zone