@article{ref1,
title="Improved volume-delay function for two-lane rural highways with impact of road geometry and traffic-flow heterogeneity",
journal="Journal of transportation engineering, Part A: Systems",
year="2021",
author="Šarić, Ammar and Lovric, Ivan",
volume="147",
number="10",
pages="e04021066-e04021066",
abstract="Two-lane rural highways represent the absolute majority of road networks globally, but there is a noticeable lack of research on this type of road for traffic planning purposes. This paper presents the relationship between average flow speed on two-lane rural highways and traffic volume and composition, and roadway horizontal and vertical geometric characteristics, expressed in the form of a volume-delay function. A new volume-delay function was developed through a combination of field research and traffic microsimulation. Field research was conducted on the main road network in Bosnia and Herzegovina. In total, more than 1 million simulations of different traffic situations were performed in an automated process. The results showed that a combination of traffic composition and geometric features (bendiness and longitudinal grade) has a crucial impact on average flow speed. The new proposed model predicts average flow speed in various traffic situations with high reliability (",
language="en",
issn="2473-2907",
doi="10.1061/JTEPBS.0000575",
url="http://dx.doi.org/10.1061/JTEPBS.0000575"
}