Studies: Graduated Licenses Lower Crash Rates

The accident rate for young drivers is falling, and the credit is going to programs that give teens their licenses only after they pass some provisional permit periods.

Researchers say they're trying to figure out why the graduated driver's license programs are so successful.

The nonprofit National Safety Council has collected 12 studies in which researchers examined similar programs in the United States, Canada and New Zealand.

In each case, the teen crash rate was reduced after the implementation of learner's permits that let teens drive only with adult supervision, and intermediate licenses that let teens drive alone, but only during daylight hours.

Exemptions are frequently incorporated to accommodate necessary driving needs for jobs, religious activities and family situations.

Researchers say the most likely reason for fewer accidents is that provisional licenses keep teens off the road, particularly at night. But researchers say it's also possible that the restrictions encourage more careful driving by teens or more parental supervision.

The National Safety Council said in a news release that auto clubs in more than 12 states are trying to get stronger teen-driving laws. Some state lawmakers, however, have said the programs infringe on parental rights.