Institute of Transportation, MOTC

Chien-Hua Chang, 2008.06
Institute of Traffic and Transportation National Chiao Tung University

　　The purpose of this study is to discuss driving behaviors at the intersections with traffic signal countdown displays, including green-light and red-light.Two neighboring signalized intersections, one with green-light countdown displays and the other without, in Hsinchu county town were chosen as study sites.Two digital vedeo cameras were used separately to collect the traffic passing through the two signalized intersections at the same time.Then we analyse the difference between the two intersections on red-running violations ,Dilemma Zone and Logistic Regression Another signalized intersection in Taipei city was chosen to collect the traffic data before the red-light countdown displays installed and after red-light countdown displays started operation at 1.5-month, 3-month, 4.5-month. Then we analyse the difference between before and after on red-running violations, headway and start-up delays.

　　It is found that red-running violations ratio with green-light countdown displays is smaller than without. Dilemma Zone with green-light countdown displays is longer than without. The traffic passing numbers with green-light countdown displays is smaller than without. .The time of driver make a choice to pass or stop with green-light countdown displays have advanced one or two seconds before the start of red light Red-running violations were reduced at 1.5-month after red-light countdown installed but its effectiveness tended to dissipate over time as the violation numbers had bounced back to more than before level Headway is no change with time. Start-up delays were raised at 1.5-month after red-light countdown installed and than decreased over time. On the whole, red-light countdown displays is better than gerrn-light countdown displays owing to its advantages is more than its disadvantages.