Evaluation of models for estimating free-flow speed on two-lane rural highways in Brazil

Latin American Transport Studies Pub Date : 2024-03-08 DOI:10.1016/j.latran.2024.100011

Thais Berger Barbosa da Silva, José Elievam Bessa Jr., Leise Kelli de Oliveira

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Abstract

The objective of this article was to evaluate different models found in the literature to estimate the free-flow speed (FFS) on Brazilian two-lane rural highways. The models available in three editions of the Highway Capacity Manual (HCM) and two adaptations of the manual were evaluated to reproduce the behavior found on Brazilian highways. This evaluation was carried out based on traffic data collected in nine homogeneous segments of a Brazilian highway (MG-050) in the state of Minas Gerais. The FFS results estimated with the analytical methods were compared with the FFS data observed directly in the field. It was identified that there is no correlation between the FFS values produced by the analytical methods and the values found in the field. However, two models, one HCM2000 and another HCM2022, adapted to Brazilian traffic conditions, have similar average FFS values to those observed in the field.

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巴西双车道农村公路自由流速度估算模型评估

本文旨在评估文献中用于估算巴西双车道农村公路自由流速度（FFS）的不同模型。对《公路通行能力手册》（HCM）三个版本中的模型以及该手册的两个改编版本进行了评估，以再现巴西公路上的行为。该评估基于在米纳斯吉拉斯州一条巴西高速公路（MG-050）的九个同质路段收集的交通数据进行。通过分析方法估算出的 FFS 结果与现场直接观察到的 FFS 数据进行了比较。结果表明，分析方法得出的 FFS 值与实地观测值之间没有相关性。不过，两个适应巴西交通条件的模型，一个是 HCM2000，另一个是 HCM2022，其平均 FFS 值与实地观测值相似。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Latin American Transport Studies

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