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Title: Impact of traffic congestion on road accidents: a spatial analysis of the M25 motorway in England
Authors: Wang, Chao
Quddus, Mohammed A.
Ison, Stephen G.
Keywords: GIS
Traffic congestion
Road accidents
Spatial modeling
M25 motorway
Issue Date: 2009
Publisher: © Elsevier
Citation: WANG, C., QUDDUS, M.A. and ISON, S.G., 2009. Impact of traffic congestion on road accidents: a spatial analysis of the M25 motorway in England. Accident Analysis and Prevention, 41 (4), pp. 798-808
Abstract: Traffic congestion and road accidents are two external costs of transport and the reduction of their impacts is often one of the primary objectives for transport policy makers. The relationship between traffic congestion and road accidents however is not apparent and less studied. It is speculated that there may be an inverse relationship between traffic congestion and road accidents, and as such this poses a potential dilemma for transport policy makers. This study aims to explore the impact of traffic congestion on the frequency of road accidents using a spatial analysis approach, while controlling for other relevant factors that may affect road accidents. The M25 London orbital motorway, divided into 70 segments, was chosen to conduct this study and relevant data on road accidents, traffic and road characteristics were collected. A robust technique has been developed to map M25 accidents onto its segments. Since existing studies have often used a proxy to measure the level of congestion, this study has employed a precise congestion measurement. A series of Poisson based non-spatial (such as Poisson-lognormal and Poisson-gamma) and spatial (Poisson-lognormal with conditional autoregressive priors) models have been used to account for the effects of both heterogeneity and spatial correlation. The results suggest that traffic congestion has little or no impact on the frequency of road accidents on the M25 motorway. All other relevant factors have provided results consistent with existing studies.
Description: This was published in the journal, Accident Analysis and Prevention [© Elsevier]. It is also available at: http://dx.doi.org/10.1016/j.aap.2009.04.002
Version: Accepted for publication
DOI: 10.1016/j.aap.2009.04.002
URI: https://dspace.lboro.ac.uk/2134/5310
ISSN: 0001-4575
Appears in Collections:Published Articles (Civil and Building Engineering)

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