Driver licensing and reasons for delaying licensure among young adults ages 18-20, United States, 2012.

Although studies of data reported by states to the US Department of Transportation appear to show a decreasing trend in licensing rates among teen-agers (Sivak and Schoettle 2012a ), those data have been shown to contain substantial errors and thus are unusable for monitoring trends (Insurance Institute for Highway Safety 2006 ).

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