Naslov
Estimation of Critical Headway at Small Urban Roundabout

Autori
Maslać, Danijela ; Cvitanić, Dražen ; Lovrić, Ivan

Izvornik
Promet - Traffic & Transportation (0353-5320) 32 (2020), 1; 103-117

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
small urban roundabout ; estimation of critical headway ; measured capacity ; model testing ;

Sažetak
Before choosing an intersection project design, an important step is to examine the justification of the construction on the basis of defined criteria. One of the key criteria is the analysis of capacity. Large numbers of roundabout capacity models are present in the world, most of them adapted to the conditions of the country they originate from and they need to be calibrated for local conditions. Key parameters for calibration are crit-ical headway and follow-up headway. Follow-up head-way can be measured directly in the field, while critical headway cannot be measured, but is estimated. Many critical headway estimation methods exist (over 30) and each of them provides different values. Different values of critical headway result in different capacity estimation values. This raises the question which method provides more realistic estimations under certain conditions. In this paper, four most frequently used critical headway estimation methods (Raff, Maximum likelihood method, Wu, Logit) were selected to be tested by comparison of theoretical capacity models and actual measured capac-ity at a small urban roundabout

Izvorni jezik
Engleski

Znanstvena područja
Građevinarstvo, Tehnologija prometa i transport

POVEZANOST RADA