Proliman and Kejaksaan Junction in Sukoharjo regency are signalized intersections equipped with a countdown timer. The installation of this tool aims to improve the level of service at the two intersections. This study intends to evaluate the performance of the countdown timer by comparing level of service and level of traffic violations when the countdown timer is turned on and off. Data related to intersection service levels was calculated using the formula in the Indonesian Road Capacity Manual (MKJI), while traffic violations were analyzed using Independent T Test. Based on the results of the analysis, it was known that there were differences in the level of service and traffic violations between two conditions. At both intersections, the delay was higher when the countdown timer was activated, with a difference of 2,9 seconds / vehicle for Proliman Junction and 1,4 seconds/vehicle for Kejaksaan Junction. The level of service at Proliman Junction increased to C when the countdown timer was turned on, while at the level of service at Kejaksaan Junction remains C for both conditions. The C level of service indicating that delay at the intersection is between 15 and 25 seconds. At both intersections, the rate of traffic violations was higher when the countdown timer was activated, with an increase of 34% for Proliman Junction and 19% for Kejaksaan Junction. Based on the results of different tests, it was known that there was a significant difference in the number of traffic violations when the countdown timer was turned on and off, with a p-value of 0,001 for both locations (H0 was rejected).

The problemof transportation isone of the problems faced in Depok, especially atintersections. Problems of traffic congestion and conflicts often occur at signalizedintersections, especially at the intersection of four signalized Depok Depok City where one ofthe efforts made to reduce conflicts in Depok intersection is done by setting the intersection.The methods used in the analysis of the performance of the intersection is the use ofcalculation on IHCM, while the traffic conflict analysis to determine the level of seriousnessof traffic conflicts is by using traffic conflict Technique (TCT) is compared to that conflictVisSim 10. Recommendation is done by using a scheme using a 3-phase elections and 3.5phase and then make a comparison with the third phase (existing) and selected the mostappropriate scenario. From the scheme of recommendations that were made by using thesoftware PTV VISSIM 10 obtained the most appropriate scheme that uses three-phasearrangement. The results of the simulation phase 3 was effective at reducing the number oftraffic conflicts and service levels are still in good condition