The Impact Evaluation of Signal Countdown Displays on Driver Behaviors

As we know, the most effective of traffic facilities on the drivers behavior and giving right of way in cities, is traffic signals. The countdown signals are used for simplifying in decision making at intersections. This research has focused on countdown signals operations. Countdown signals in Iran are displayed remained green and red time based on previous cycle and by the reason of changing in cycle length sequences in actuated signals has encountered with some problems so. This research evaluate countdown signals operation and problems based on interview of Iranian drivers.