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Passenger Car Equivalents for Heavy Vehicles at Freeways and Multilane Highways: Some Critical Issues
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Passenger Car Equivalents for Heavy Vehicles at Freeways and Multilane Highways: Some Critical Issues
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Journal Article
Passenger Car Equivalents for Heavy Vehicles at Freeways and Multilane Highways: Some Critical Issues
2006
Overview
One of the important issues affecting the accuracy of traffic analyses is heterogeneity in the vehicular traffic mix that composes a traffic stream. Heavy vehicles, which usually constitute the remaining smaller proportion of a traffic mix, are larger in dimension and often inferior to passenger cars in performance. In the US, the Highway Capacity Manual (HCM) provides passenger car equivalents (PCEs) for use in capacity and level of service analyses. This feature aims to shed light on some important issues critical to the understanding of the effect of heavy vehicles on traffic flow and, therefore, on the use of PCEs for heavy vehicles in traffic analyses. These issues are: 1. mechanism of heavy vehicles' effect, 2. equivalency criteria, 3. application type, and 4. heavy vehicle mix. PCE factors for heavy vehicles are an effective means to account for the presence of heavy vehicles in the traffic stream in performing traffic analyses.
Publisher
Institute of Transportation Engineers
Subject
