LBS-Based Dilemma Zone Warning System at Signalized Intersection

  • Yi Li
  • Junhua WangEmail author
  • Lanfang Zhang
Part of the Lecture Notes in Geoinformation and Cartography book series (LNGC)


In the field of traffic engineering, drivers’ confusion during yellow interval is a great danger to traffic safety. To help drivers solve such problem, an LBS-based dilemma zone warning system at signalized intersection is designed. Different from other dilemma zone solving systems, this is an active safety system, which makes it possible to help drivers take active actions according to reliable warnings. An algorithm based on data from Differential Global Positioning System (DGPS) and traffic signal detector (TSD) was built in the single-chip microcomputer of Dedicated Short Range Communication (DSRC). Corresponding voice warnings (“stop” or “go”) would be sent to drivers by on-board voice alerter. Besides, communication delay and drivers’ reaction time were taken into consideration in the design of warning areas ahead of dilemma zone. To reveal characteristics of reaction time, a field test has been conducted and the reaction time is shorter than current standard. When vehicles are detected in different warning areas, drivers would get alarmed at the beginning of yellow interval. Moreover, this system has been verified feasible in theory by a case study at signalized intersection.


LBS Dilemma zone DSRC Warning system Drivers’ reaction time 



This research is supported by National High Technology Research and Development Program of China (863 Program)—Active traffic safety oriented urban vehicle location services online technology. The technical support of DSRC is provided by Wuhan University and Tongji University.


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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  1. 1.School of Transportation EngineeringTongji UniversityShanghaiChina

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