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Why does carrying passengers increase the crash risk for teen drivers? There are some possible explanations: 
It is possible that teenagers are more likely to be speeding, running red lights, and performing other risky behaviors when traveling with peers.
It is also possible that teenagers do not fully concentrate on the driving task while traveling with peers.
If the teenagers are traveling with passengers who can legally purchase alcohol, they might bring alcohol into the car and increase the likelihood of driver being impaired by alcohol.