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Citation |
Janke MK. Transp. Res. Rec. 1994; 1438: 77. |
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Copyright |
(Copyright © 1994, Transportation Research Board, National Research Council, National Academy of Sciences USA, Publisher SAGE Publishing) |
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DOI |
unavailable |
PMID |
unavailable |
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Abstract |
California's Mature Driver Improvement (MDI) Program offers insurance-premium reductions to older drivers completing an accredited driver-improvement course. Driving records of five cohorts (1988-1992) of course graduates and comparison drivers were analyzed. MDI subjects were volunteers; comparison subjects were sampled randomly from the automated driver file. Unadjusted 6-, 18-, and 30-month subsequent total crash rates of MDI and comparison drivers did not differ significantly between groups (p <.10, two-tailed) for any cohort or record length. Unadjusted fatal and injury crash rates showed significant differences in favor of the MDI group in the first two cohorts and a significant difference in favor of the comparison group in a later cohort. The unadjusted accident rates indicate no justification for offering insurance discounts to those completing the course after 1989. All between-group differences on unadjusted citation rates were significant, favoring the MDI group. Analyses of covariance showed, in two cohorts, significant differences favoring the comparison group on adjusted total crashes. In two cohorts there were significant differences on adjusted fatal and injury crashes, one favoring the MDI and one the comparison group. On citations all adjusted differences were significant, favoring the MDI group. Analyses to two cohorts' 6-month data using generalized two-stage least-squares regression indicated that program completion was associated with more total and fatal and injury crashes and fewer citations. Language: en |