Adaptation of the HCM for the analysis of two-lane rural highways without passing lanes in Brazil
DOI:
https://doi.org/10.14295/transportes.v30i3.2690Keywords:
Level of service, Two-lane highways, Traffic simulationAbstract
The Highway Capacity Manual (HCM) is the main document used to analyze the level of service and capacity of highway facilities. However, applying its methodology without adjustments to local traffic and road conditions and vehicle and driver characteristics can result in discrepancies between the performance measures calculated using the manual and those observed in the field. This paper aimed to adapt the new HCM method (7th edition) to the conditions of Brazilian two-lane rural highways without passing lanes. With a recalibrated version of Aimsun Next, simulation results were generated for hypothetical segments to adjust the traffic models to obtain the follower density (FD), the new service measure proposed for evaluating two-lane highway segments. The FD results found with the proposed method showed that the HCM traffic models need to be adapted to evaluate Brazilian highways to avoid levels of service that underestimate what is observed in the field.
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