Evaluating drivers licensed with medical conditions in Utah, 1992 - 1996

  • Published: Utah CODES, US Department of Transportation, 2000
  • Authors: E. Diller, L. Cook, D. Leonard, J. Reading, J. Dean and D. Vernon
  • Date Added: 14 Feb 2013
  • Last Update: 20 Mar 2013
  • Format: pdf


Comparison of citation, RTI and at fault RTI rates of restricted and unrestricted drivers with medical conditions, to inform future licensing restriction conditions.


Use of comparison group and probabilistic linkage to derive rates and relative risks. The work deals with different categories of disability separately, not all are relevant to mobility impairment.

Key Findings:

  • Typically disabled drivers exhibited higher RTI rates or risks than the comparison groups, though not by a significant margin.


Medical conditions, licensing, RTI rate.


Small sample numbers for disabilities linked to impairment of mobility; however confidence intervals stated to allow fair assessment. One of the only studies which appears to show that disabled drivers may be at increased risk of RTI involvement.