As this article in the LA Times puts it:
For more than a decade, California and other states have kept their newest teen drivers on a tight leash, restricting the hours when they can get behind the wheel and whom they can bring along as passengers. Public officials were confident that their get-tough policies were saving lives. Now, though, a nationwide analysis of crash data suggests that the restrictions may have backfired: While the number of fatal crashes among 16- and 17-year-old drivers has fallen, deadly accidents among 18-to-19-year-olds have risen by an almost equal amount. In effect, experts say, the programs that dole out driving privileges in stages, however well-intentioned, have merely shifted the ranks of inexperienced drivers from younger to older teens.
The LA Times article is based on a study published in the Journal of the American Medical Association, which can be viewed here.
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