Identifying Critical Road Geometry Parameters Affecting Crash Rate and Crash Type
Paper in proceedings, 2009

The objective of this traffic safety investigation was to find critical road parameters affecting crash rate (CR). The study was based on crash and road maintenance data from Western Sweden. More than 3000 crashes, reported from 2000 to 2005 on median-separated roads, were collected and combined with road geometric and surface data. The statistical analysis showed variations in CR when road elements changed confirming that road characteristics affect CR. The findings indicated that large radii right-turn curves were more dangerous than left curves, in particular, during lane changing manoeuvres. However sharper curves are more dangerous in both left and right curves. Moreover, motorway carriageways with no or limited shoulders have the highest CR when compared to other carriageway widths, while one lane carriageway sections on 2+1 roads were the safest. Road surface results showed that both wheel rut depth and road roughness have negative impacts on traffic safety. Keywords: Traffic Safety, Crash Analysis, Road geometry, Road Surface, Curve safety, Crash Data.

Traffic Safety

Crash Data.

Crash Analysis

Road geometry

Curve safety

Road Surface


Sarbaz Najib Othman

Chalmers, Applied Mechanics, Vehicle Safety

Robert Thomson

Gunnar Lanner

Chalmers, Civil and Environmental Engineering, GeoEngineering

Association for the Advancement of Automotive Medicine (AAAM), 53rd Annual Meeting - October 4-7, 2009 - Baltimore


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Other Materials Engineering

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