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Safety Problems in Urban Cycling Mobility: A Quantitative Risk Analysis at Urban Intersections

Department of Civil, Construction and Environmental Engineering, Sapienza University of Rome, 00184 Rome, Italy
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Received: 5 December 2018 / Revised: 19 January 2019 / Accepted: 21 January 2019 / Published: 22 January 2019
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Abstract

The attention to the most vulnerable road users has grown rapidly in recent decades. The experience gained reveals an important number of cyclist fatalities due to road crashes; most of which occur at intersections. In this study, dispersion of trajectories in urban intersections has been considered to identify the whole conflict area and the largest conflict areas between cars and bicycles, and the speeds have been used to calculate exposure time of cyclists and reaction time available to drivers to avoid collision. These data allow the summary approach to the problem, while a risk probability model has been developed to adopt an elementary approach analysis. A quantitative damage model has been proposed to classify each conflict point, and a probabilistic approach has been defined to consider the traffic volume and the elementary unit of exposure. The combination of damage and probability, permitted to assess the risk of crash, at the examined intersection. Three types of urban four-arm intersection, with and without bike paths, were considered. For each scheme, the authors assessed the risk of collision between the cyclist and the vehicle. The obtained results allowed the identification of the most hazardous maneuvers and highlighted that geometry and kinematics of traffic movements cannot be overlooked, when designing an urban road intersection. The strategy proposed by the authors could have a significant impact on the risk management of urban intersections. The obtained results and the proposed hazard estimation methodology could be used to design safer intersections. View Full-Text
Keywords: reaction time; exposure time; cycling mobility; urban intersection; vulnerable users reaction time; exposure time; cycling mobility; urban intersection; vulnerable users
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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MDPI and ACS Style

Cantisani, G.; Moretti, L.; De Andrade Barbosa, Y. Safety Problems in Urban Cycling Mobility: A Quantitative Risk Analysis at Urban Intersections. Safety 2019, 5, 6.

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