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DOI:
https://doi.org/10.14295/transportes.v23i3.936Keywords:
Highways, HCM, Volume-Delay FunctionsAbstract
This paper identified in the literature and described the most commonly used delay functions in transportation demand modeling packages: (1) BPR; (2) Conical; (3) Akçelik function; and (4) Logit-Based. Then it was tested the compatibility between these four VDFs and the current HCM models, calibrated to Brazilian highways. As the main conclusions, it was observed that the best fits were obtained using the BPR and the Logit-Based Functions. On the other hand, the Conical and Akçelik functions should be used with caution, since they tend to underestimate the delay for low to moderate traffic flows, common in rural highways. Specifically with respect to two-lane highways, the Logit-Based function has proved to be of interest, because of its capability to reflect more severe delays for low traffic flows, while producing greater delays for congested conditions, which is a desirable characteristic in demand modeling.Downloads
References
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