When you've got company in your car.

• Position: SAFETY - Teenage car passengers

The roadways might be a lot safer if there were fewer teenage boys in the passenger seat. A recent study suggests that when a teenage boy is the front-seat passenger, a teenage driver--whether boy or girl--becomes more careless. The study, by the National Institute of Child Health and Human Development, also found that when boy drove with a girl in the passenger seat, he drove more safely. If a girl drove with another girl, she tended to be a bit less careful, than a girl driving...