Estimation of Level of Service at Signalized Intersections around the Proposed Health Campus in Etlik Ankara

Kazemi Afsar, Ali Asghar
Tüydeş Yaman, Hediye
A proposed integrated health campus with a total bed capacity of 3566 will be built in Etlik, Ankara in an area surrounded by two urban corridors and served by four 3-legged signalized intersections. As the project is a large health campus including emergency services, it is important to assess its accessibility at these intersections by determining the levels of service (LOS), which is the objective of this study. According to Highway Capacity Manual (HCM), the estimation of LOS for a signalized intersection requires the determination of control delay which includes uniform, incremental and initial queue delays. The first two delay components require signalization and flow parameters such as effective green, cycle length, etc., which are estimated based on traffic surveys via video recordings. The initial queue delay, however, could be estimated by simulating the observed corridor flows in Synchro v.8, and obtaining the queue lengths. The results showed that two corridors surrounding the campus area have different flow characteristics especially during the weekday peak periods: the intersections on the south corridor have lower LOS levels ranging from C to F, due to the heavy transit traffic to/from the city center in the peak hours. The north corridor currently carries less traffic, which resulted in LOS ranging from C to E on peak hour. Main problem is the high volumes on the major roads, even in the current situation, thus proposed project must include solutions for better management of these intersections under even higher volumes after project start.
Citation Formats
A. A. Kazemi Afsar and H. Tüydeş Yaman, “Estimation of Level of Service at Signalized Intersections around the Proposed Health Campus in Etlik Ankara,” presented at the 11th International Congress on Advances in Civil Engineering, (21-25 October 2014), Istanbul, Turkey, 2014, Accessed: 00, 2021. [Online]. Available: