Start-up Lost Time and its Effect on Signalized Intersections in Turkey

Start-up lost time is an important parameter in performance of signalized intersections which may in turn depict the effect of behaviour of different drivers for different countries. In this study the parameters affecting the startup lost time in Turkey will be defined and a model will be established to present the relationship between start-up lost time, saturation flow as well as start response time with the behaviour of Turkish drivers. For this purpose, observations were carried out at eight intersections in Turkey. Analyses have shown that saturation headways decrease with the increase in time in start response since the drivers in the 2nd and higher rows of a queue have a longer time to get prepared to discharge. Results also indicated that start-up lost time increases rapidly as cycle time increases, and lower start-up lost time values can be observed in left or right turning lanes.</p

The Effect of Drivers’ Behavior on Performance of Signalized Intersections

Çalışmada, kentiçi sinyalize kavşaklardaki sürücü davranışlarının, kavşak başarımı üzerindeki etkilerinin incelenmesi hedeflenmiştir. Bu amaçla, İzmir kent merkezinde yer alan üç sinyalize kavşakta sürücü anketleri ile eş zamanlı tepki süresi ve kuyruk uzunluğu verileri toplanmıştır. Anketlerden elde edilen sürücü davranışlarını açıklayıcı çeşitli ölçeklerden yararlanarak özellikle sürücü tepki sürelerinin modellenmesine çalışılmıştır. Analizler sonucunda, sürücülerin yaş ve tecrübeleri arttıkça güvenlik algılarının da arttığı görülmüştür. Güvenlik ölçeği değerinin 39~50 arasında değiştiği; buna bağlı olarak, başlangıç tepki sürelerinin uzadığı ve sinyalize kavşaklardaki ortalama taşıt gecikmelerinin de yaklaşık %20 oranında arttığı bulunmuştur.In this study investigating the effect of driver behavior on performance of signalized intersections is aimed. For this purpose, a questionnaire is drawn up to assess simultaneously queue length and start response time data at three signalized intersections in İzmir city center. Especially start response times of drivers are tried to be modeled using various physiological scales which explain drivers’ behavior. Analyses have shown that, as the age and experience of drivers increase, their perception of safety also increases. It is found that perception of safety changes between 39~50 years of age and with respect to this, start response times are extended and average delay values increase by approximately 20% at signalized intersections