@article{ref1,
title="Preferred time headway of drivers on two-lane highways with heterogeneous traffic",
journal="Transportation letters",
year="2019",
author="Saha, Pritam and Roy, Rupali and Sarkar, Ashoke Kumar and Pal, Manish",
volume="11",
number="4",
pages="200-207",
abstract="This paper presents an investigation on the adequacy of one of the major performance indicators for two-lane highways, the percent-time-spent-following (PTSF) under changing driver's behavior in choosing headways. Field study was conducted on a two-lane highway in India that exhibits heterogeneity in its traffic composition and a wide range of flow levels was covered while collecting data. The appropriate headway distributions were selected based on goodness-of-fit test. Exponential or Erlang distributions exhibit their aptness in describing headways up to a volume to capacity ratio of 0.3 and gamma and exponential distributions were compatible for headway data corresponding to a volume to capacity ratio of 0.4 and above. Around 40% drivers were observed to adopt headways 2 s or less at heavy flow when a car-following situation prevails; these headways are considered unsafe in several instances. Further, speed-headway relationships were established to assess a headway threshold beyond which vehicles could be considered free. Empirical investigation indicates a value of about 6 s under such traffic unlike 3 s as considered in PTSF estimation. Another major implication on PTSF is a few drivers move in a platoon by choice even if they have a gap of more than 6 s and passing opportunities.<p /> <p>Language: en</p>",
language="en",
issn="1942-7867",
doi="10.1080/19427867.2017.1312859",
url="http://dx.doi.org/10.1080/19427867.2017.1312859"
}