Crash Prediction Models for Older Drivers: A Panel Data Analysis Approach
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1996
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TRIS Online Accession Number:784570
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NTL Classification:NTL-SAFETY AND SECURITY-Highway Safety;NTL-SAFETY AND SECURITY-Human Factors;
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Abstract:The graying of America is resulting in a larger proportion of older individuals
in the population. Recent transportation surveys show that an increasing number
of older individuals are licensed to drive and that they drive more than their
same age cohort a decade ago. These trends necessitate increased study of their
potential highway safety problems. Considerable progress has been made on
understanding older drivers safety issues. Nonetheless, research has been
rather limited and the findings inconclusive. One of the methodological
limitations is the lack of considering temporal order between events (i.e., the
time between onset of medical condition, symptom, and crash). Without
time-series data, researchers have often linked a "snap-shot" of medical
conditions and driving patterns to more than one year of crash data, hoping to
accumulate enough data on crashes. The interpretation of the results from these
studies is difficult in that one cannot explicitly attribute the increase in
highway crash rates to medical conditions and/or physical limitations. This
paper uses a panel data analysis approach to identify factors that place older
drivers at greater crash risk. Our results show that factors that place female
drivers at greater crash risk are different from those influencing male drivers.
More risk factors were found to be significant in affecting older mens
involvement in crashes than older women. When the analysis controlled for the
amount of driving, women who live alone or who experience back pain were found
to have a higher crash risk. Similarly, men who are employed, score low on
word-recall tests, have a history of glaucoma, or use antidepressant drugs were
found to have a higher crash risk. The most influential risk factors in men
were the amount of miles driven, and use of antidepressants.
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