ABSTRACT

The high growth of the population in Malang will trigger an increase in the activity of its, resulting in increased traffic. Increased traffic demands will add to traffic congestion problems on roads and intersections. One way of traffic engineering to improve signaled intersection performance is to cquip traffic signals with countdown timers. This additional instrument serves to inform the duration of the signal setup time. This study aims to determine the effect of countdown timer use on saturation flow, performance and safcty factor signalized intersection in Malang. The paired sample t-teste statistical method is used to sec the influence of the countdown timer on saturation flow, and the impact on the performance and safety of the intersection arm. The use of countdown timer can increase the value of saturation flow, so the capacity of the intersection also increased 5-22%a with decreasing delay time 5-13 sec/smp. But the less positive impact on the safety factor intersection, because there is an increase in the movement of vehicles before the green time.