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Evaluation of heavy vehicles on capacity analysis for roundabout design : USDOT Region V Regional University Transportation Center final report : technical summary.
  • Published Date:
    2016-12-15
  • Language:
    English
Filetype[PDF-249.30 KB]


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  • Abstract:
    Heavy vehicles have a much larger effect on the flow of a roundabout than a passenger car, and therefore they must be accounted for in the design (Transportation Research Board). Very few studies have looked at the effect of heavy vehicles on the flow of a roundabout. In Chapter 21 of the Highway Capacity Manual, roundabouts are addressed and a passenger car equivalent (PCE) factor of 2.0 is suggested for all heavy vehicles (Transportation Research Board).

    The purpose of this research is to study the passenger car equivalent factor for heavy vehicles. Experience suggests that heavy vehicles, particularly semi-trucks, have a greater impact on a roundabout than two passenger cars in urban areas. It is expected that the impact of heavy vehicles on the functionality of the roundabout will vary with demand. The objective of this research is to provide support for the current 2.0 PCE or determine new heavy vehicle equivalence for the design of roundabouts.

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