Delay-based passenger car equivalents for trucks at signalized intersections

Delay-based Passenger Car Equivalent at Signalized Intersections in Iran

“…According to the Benekohal and Zhao's study [5], the volumes and heavy vehicle percentage have been identified as major factors affecting d-PCE. Therefore, to attain a d-PCE predictive model, samples of intersection delays varying by traffic volume and heavy vehicle percentage are needed.…”

“…This method, called the headway ratio method, is commonly used for measuring PCE at signalized intersections [5,7]. Branston and van Zuylen developed a multiple regression method for estimating PCE at signalized intersections in 1978.…”

“…delay-based passenger car equivalent). In this method, d-PCE is estimated according to the following formula [5]: calculates FHV [7]:…”

“…In these two steps the intersections and approaches were selected based on criteria compiled from research conducted in Benekohal and Zhao's study [5]. In the first step, the intersections were chosen based on the features listed below: -All the intersections had pre-timed signal timing during the time of the survey; -Flows at intersections were sustained at the saturation flow rate level; -The selected intersections represented the typical ones with common geometric design conditions; -These intersections were chosen from different locations throughout the city of Tehran to represent all the city intersections.…”

“…This factor increased to 2 in HCM 1994, 1997 and 2003 [4]. However, since the PCE depends on factors influencing traffic flow parameters [5], setting it at a constant value under different roadway and traffic conditions may not be correct. Therefore, development authorities are developing standards based on regional characteristics [6].…”