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Gerontologist. 2009 Aug;49(4):474-84. doi: 10.1093/geront/gnp039. Epub 2009 Jun 2.

Do restricted driver's licenses lower crash risk among older drivers? A survival analysis of insurance data from British Columbia.

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Performance Analysis Services, Insurance Corporation of British Columbia, 404-132 West Esplanade, North Vancouver, Canada V7M 1A2.

Erratum in

  • Gerontologist. 2009 Dec;49(6):865.



Faced with an aging driving population, interest is increasing in the use of restricted licenses or "graduated delicensing" for older drivers to allow them to safely retain a driver's license. The primary purpose of this study was to determine whether restricted licenses are successful at mitigating number of crashes per year and whether they can extend the period of crash-free driving for aging adults.


Using a cohort study design, licensing and insurance claims crash records of all drivers aged 66 years and older in British Columbia were examined for the years 1999-2006. Nonparametric and Cox proportional hazards survival analyses were used to compare restricted vs. unrestricted drivers and to estimate crash risks.


The risk of causing a crash for restricted drivers was 89% (or 11% lower risk) compared with unrestricted drivers after controlling forage and gender.[corrected]. The most common restriction was a combination of daylight driving only plus a speed maximum of 80 km/hr. Restricted drivers retained a driver's license for a longer period of time than unrestricted drivers and continued to drive crash free longer than unrestricted drivers. There was no difference in severity of collisions, and results suggest a high level of compliance with daylight-only restrictions.


These findings suggest that driving restrictions may be effective for prolonging the crash-free driving of some aging drivers, thus supporting their continued independence and delaying institutionalization. Further studies are needed to determine which drivers are most likely to benefit from restricted licenses.

[Indexed for MEDLINE]

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