Recent changes in the age composition of U.S. drivers : implications for the extent, safety, and environmental consequences of personal transportation.
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2011-06-01
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Abstract:"This study examined the changes from 1983 to 2008 in the percentage of persons with
a driver’s license as a function of age. The results indicate that, over the past 25 years, there
was a substantial decrease in the percentage of young people with a driver’s license, and a
substantial increase in the percentage of older people with a driver’s license. Furthermore, for
cohorts who were between 20 and 44 in 1983 (and thus between 45 and 69 in 2008), the
percentage of licensed drivers has not changed appreciably between 1983 and 2008. This
finding suggests that, for all practical purposes, all those who wanted to get a driver’s license
did so by age 20. Finally, for cohorts who were between 45 and 59 in 1983 (and thus between
70 and 84 in 2008), this percentage dropped substantially. This finding reflects the giving up
of driver’s licenses with advanced age. The potential implications of future licensing trends on
vehicle demand, safety, and environment were briefly discussed."
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