Research Papers

Findings from the Candrive/Ozcandrive Study: Low mileage older drivers, crash risk and reduced fitness to drive

Filename FINAL-PAPER-92.docx
Filesize 72 KB
Version 1
Date added June 10, 2012
Downloaded 3 times/fois
Category 2012 CMRSC XXII Banff
Tags Session 4B
Author/Auteur Jim Langford, Jude Charlton, Sjaan Koppel, Anita Myers, Holly Tuokko, Shawn Marshal, Malcolm Man-Son-Hing


A small but growing body of research evidence suggests that older drivers' crash risk based on traditional exposure measures is exaggerated. Once annual driving distances were controlled for, only the minority of older drivers with low driving mileages have a heightened crash risk - while those with high and middle driving distances are at least as safe as drivers from other age groups. Failure to control for annual driving distances has been referred to as the low mileage bias.

The association between low mileage and heightened crash risk is usually attributed to location of driving. In the main, low mileage drivers do most if not all of their driving in urban areas, where the prevalence of complex traffic situations (and particularly intersections) results in increased crash risk. However there is also the possibility of a second factor. It may be that at least some low mileage drivers have reduced their driving in response to perceived or actual declines in basic fitness to drive - a possibility which has clear implications for licensing authorities when managing older driver safety.

This paper uses data from the Candrive/Ozcandrive prospective study of older drivers to investigate the association between annual driving distances and: crash involvement per driver and per kilometre driven; functional fitness to drive; and driving performance. All drivers in the Candrive/Ozcandrive older driver cohort study were allocated to one of three groups, according to their self-reported annual driving distances:5000 and

The paper has added to the growing body of research which suggests that the so-called 'older driver problem' is most pertinent to a small sub-group of low mileage drivers with reduced fitness to drive - which for this sample and for the distance parameters used, represented less than 14 percent of the total sample.

Jim Langford, Jude Charlton, Sjaan Koppel, Anita Myers, Holly Tuokko, Shawn Marshal, Malcolm Man-Son-Hing