Crash Risk of Drivers with Physical and Mental (P & M) Conditions and Changes in Crash Rates Over Time

This study reviews recent research evaluating traffic safety in individuals diagnosed with epilepsy, syncope, dementia/Alzheimer's Disease, diabetes, and sleep disorders. Additionally, this study evaluates the crash risk of drivers identified as having a physical or mental condition which may affect their ability to drive safely, and compared these findings to previous DMV reports which evaluated crash risk in this population. Research has repeatedly demonstrated that these drivers have a higher crash rate relative to the general population of drivers (Janke, Peck, & Dryer, 1978; Janke, 1993; Mitchell & Gebers, 2001). Crash rates for all drivers referred to DMV for a medical condition in the 2007 calendar year, and were assigned a P&M code (alcohol, drugs, lack of skill, lapses of consciousness, mental condition, or physical conditions) on their driving record were compared to crash rates for the general population of drivers. The mean crash rate for each of the P&M groups was higher than both the general population of drivers (7 per 100 drivers) and males under 25 (10 per 100 drivers). Relative to prior DMV studies, mean crash rates for drivers with a P&M designation of drug addiction, lapses of consciousness, and mental condition had dropped. A logistic regression where age and sex were controlled demonstrated an increased crash risk for each of the P&M conditions ranging from 2.8 to 13.3 times higher than the general population, with individuals with a mental condition having the lowest odds ratio and lack of skill having the highest odds ratio. The odds ratios for all conditions were higher than observed in prior DMV studies. One reason for this increase was an observed decrease in crash rates for the general population of drivers which did not correspond to a drop in crash rates for drivers with a P&M condition. Future research needs to evaluate the specific medical conditions within each P&M designation to better understand the relationship between medical conditions and crash risk in this population of drivers.


  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Features: Appendices; Figures; References; Tables;
  • Pagination: 54p

Subject/Index Terms

Filing Info

  • Accession Number: 01634043
  • Record Type: Publication
  • Report/Paper Numbers: CAL-DMV-RSS-17-252
  • Files: BTRIS, TRIS
  • Created Date: May 1 2017 9:37AM