Title: Introducing a revised model for determination of rollover threshold speed of buses

Authors: Mohammadreza Sabouri; Arman Hamidi

Addresses: Civil Engineering Department, Sharif University of Technology, Azadi Avenue, Tehran, 1458889694, Iran ' School of Civil Engineering, College of Engineering, University of Tehran, Enqelab Square, Tehran, 1417614418, Iran

Abstract: Rollover is critical for intercity bus vehicles, as they often carry a large number of passengers while having a relatively high centre of gravity. Utilising the same models for determining the rollover threshold speed (RTS) of different types of vehicles may induce some errors, as most of the existing models do not consider several factors such as vehicle type and dimension, vehicle load, turning radius of the axles, and diversion angle of the curve. This study intends to propose a more accurate relationship for determining the rollover speed of the intercity bus vehicles considering the aforementioned factors. Using the revised model, it was shown that when both the radius of the horizontal curve and the diversion angle are small, the diversion angle plays an important role in determining the RTS. The results also suggest that under the assumptions of this study, the RTS for three-axle buses happens at lower speeds compared to two-axle buses.

Keywords: centre of gravity height; curve radius; diversion angle; heavy vehicles; intercity bus; payload; regression model; rollover collisions; RTS; rollover threshold speed; superelevation; traffic accidents; TruckSIM.

DOI: 10.1504/IJHVS.2020.112974

International Journal of Heavy Vehicle Systems, 2020 Vol.27 No.6, pp.723 - 742

Received: 08 May 2019
Accepted: 13 Jun 2019
Published online: 12 Feb 2021 *

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