The effect of road features on predicting the operating speed of an urban highway (Mashhad case study)

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Document Type : Original Article

Authors

1 College of Skills and entrepreneurship , Mashhad Branch , Islamic Azad University , Mashhad , Iran

2 Civil Engineering Department, Payam e Noor University, P.O.Box. 19395-4697, Tehran, Iran

3 civil Engineering Department Payam e Noor University T P.O.Box .19395-4697.Tehran.Iran

10.22034/road.2024.436614.2243

Abstract

This article seeks to investigate the effect of the geometric characteristics of an urban highway on the change of operating speed. The studied urban highway is divided into separate sections according to the range of highway features. The operating speed of each section of the highway has been calculated in 24 hours of a normal day and night. The operating speed difference of each section compared to the allowed speed of the same section is calculated in 24 hours a day and the operating speed difference of 85% is expected in this research.

Using statistical analysis software and Python coding, the impact of road features in predicting the difference between the operating speed and the speed limit has been determined. The results showed that in terms of the horizontal alignment, the ratio of the length of two consecutive sections, the length and width of the studied section and the presence of a simple curve in the section before the studied section and in terms of the vertical alignment of the road , the presence of a concave curve in the section before the studied section from The most important control factors are the operating speed difference from the road speed limit. According to the results of this research, it was determined that the threshold of the impact of road features is the ratio of the length of the studied section to the length of the section before it is less than 1.5.

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