Variation of Headways at Signalized Arterials with Respect to Distance and Cycle Times

In this study, the variation in the proportion of free vehicles at a signalized arterial is tried to be modeled with respect to distance and green/cycle time ratio. In the analysis, it is assumed that headways between vehicles can be defined with Cowan M3 distribution. From the analysis, proportion of free vehicles in the left lane of an arterial is lower than other lanes. This results indicates that, left lanes are occupied by higher vehicle volumes. The analysis also showed that, proportion free vehicles increase with respect to the distance to traffic signals as expected.

Sinyalize Arterlerde Araç Takip Aralýklarýnýn Mesafeye ve Devre Süresine Baðlý Deðiþimi

Çalýþmada Ýzmir’deki sinyalize arterlerden elde edilen verilerden yararlanarak, serbest araç oranýnýn mesafeye ve akým yukarý sinyale ait yeþil süre/Devre süresi oranýna baðlý deðiþimi modellenmeye çalýþýlmýþtýr. Modelleme aþamasýnda araçlarýn takip aralýklarýnýn Cowan M3 daðýlýmýna uyduðu kabul edilmiþtir. Yapýlan hesaplamalar sonucunda sol þeritteki serbest araç oranýnýn, diðer þeritlere oranla daha düþük olduðu; dolayýsýyla daha fazla araç tarafýndan kullanýldýðý anlaþýlmýþtýr. Ayrýca hesaplar, “Alfa” deðerinin, beklenildiði gibi, sinyalden uzaklaþtýkça arttýðýný göstermiþtir.