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DOI:
https://doi.org/10.14295/transportes.v23i4.949Keywords:
Expressways, quality of service, passenger-car equivalents, traffic data.Abstract
In this paper, the impact of heavy vehicles on the quality of service is studied by means of PCE estimates ob-tained from empirical data collected on divided highways in the state of São Paulo, for short time intervals (5 or 6 minutes). PCE estimates were calculated for each time interval using Huber’s method, assuming that the quality of service is the same for all traffic lanes during a given interval. The leftmost lane represented the basic flow (cars only) for the intervals in which no trucks are detected on the left lane, whereas observed flow on the rightmost lane was the mixed flow (trucks and cars). The results suggest that: (1) in 52% of the time the quality of service is not the same in all traffic lanes; (2) the marginal impact of trucks decreases as the number of trucks in the traffic stream increases; and (3) differences in PCE due to the level of service become less noticeable in steeper up grades, where truck loss of speed due to poor performance characteristics is greater.Downloads
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