Assessment and Modelling of Driver Behaviour in Dilemma Zone of Signalized Intersection

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Addis Ababa University


Driving behaviour at signalized intersections is the main contributing factor to the operational and safety level of road users. Improper decision of drivers when signal changes from green to yellow might lead to right angle collision or rear end collision. This is mostly due to a driver becomes indecisive whether to pass or stop at the intersection on the yellow onset, which is called dilemma zone. The main motive of the study is to investigate the factors that influence the driver behaviour in dilemma zone at signalized intersection. The output of this study is used for transport planner, geometric designer and traffic management agency for evaluation of existing urban intersections and identifying factors which are used for decreasing accidents occurred at the intersection. For this research matter, the data was collected at four signalized approaches by collecting field data using video capturing technique in order to investigate the driver behaviour. Frame by frame manual extraction by using VLC media player resulted in a total of 397 driver responses at the yellow onset. After manual extraction binary logistic regression model is developed by using SPSS 22.0 in order to represent the observed behaviour. The factors which are found to be important in drivers stop/go decisions are distance from stop line, vehicle‟s approach speed and vehicle type. From 397 driver responses 41 of them which are 10.33% of driver responses at the yellow onset were red light runners. In order to assess the driver‟s behaviour when they see yellow traffic lights, driver attitudinal survey was conducted. Based on the collected questionnaire data, 32.4% have been involved in an accident at an intersection and 27.3% end up red light runners by sometimes try to catch the yellow light. In addition based on the questionnaire data, factor analysis, was conducted. Factor analysis was done to form few factors from 14 original conditions that affect the decision to cross or stop when the drivers see yellow light based on correlation between each reason. Based on the result of analysis, 14 original conditions was grouped in to five few factors which are understandable and easy for interpretation. These are Emotion and understanding of the driver, Roadway and variable control condition, Comfort to drive, Presence of vehicle and police and Past experience of driver which were contributed to explained 59.56 % of variance.



Driver behaviour, Dilemma zone, Red light runners, Yellow signal, Stop/Go decisions