The 9222 vehicles in the CPIR3 data set were examined for evidence that would indicate whether tinted windshields cause or prevent accidents. Windshield-tint condition was known for 4185 vehicles, and these were almost evenly split between clear and tinted windshields. The proportions of tinted windshields among these accident vehicles were smaller than those for U.S.-produced vehicles of comparable model years. Weighted least squares regressions showed that the proportion of drivers having tinted windshields increases as age increases, but that there are no statistically significant differences between daytime and nighttime conditions. It was concluded from the regression analyses that the data do not support the hypothesis that older drivers are negatively influenced at night with tinted windshields. It was also found that tinted windshields are associated with a variety of driver and vehicular variables believed to influence accident risk. Because of these uncontrolled, confounding variables, and because of methodological limitations associated directly with the CPIR file, it is not possible to isolate the influence of windshield tinting in accident causation or prevention.
Tinted Windshield Involvement Among CPIR Accidents
1979
53 pages
Report
No indication
English