This study develops passenger-car equivalents (PCEs) for heavy vehicles at roundabouts. For this task, the movements of cars and heavy vehicles were observed using video records collected from three roundabouts in Vermont; Ontario, Canada; and Wisconsin. The PCE was developed such that the variation in the entry capacity in a various mix of cars and heavy vehicles was minimized. The PCE was also applied to the prediction of the entry capacity using a roundabout capacity model. For the model inputs, the study adjusted the critical headway and the follow-up headway to account for the difference in driver's gap acceptance behavior between cars and heavy vehicles. The result shows that the PCEs for heavy trucks and light trucks are 1.5-2.5 and 1.0-1.5, respectively, at the three roundabouts. In particular, the PCE for light trucks was lower than a default value of 2.0. The result also shows that the established model generally predicted the capacity more accurately when the critical headway and the follow-up headway were adjusted by different weights instead of the same weight (i.e., the default value of the PCE).
Developing Passenger-Car Equivalents for Heavy Vehicles in Entry Flow at Roundabouts
Journal of transportation engineering ; 141 , 8 ; 1
2015
Aufsatz (Zeitschrift)
Englisch
Developing Passenger-Car Equivalents for Heavy Vehicles in Entry Flow at Roundabouts
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