1.   Highway safety experts say the passenger restriction and a tougher nighttime driving curfew is essential to staving off serious accidents.

2.   Still others panned as unenforceable the nighttime driving curfews and a ban on all unrelated passengers for the first six months a new driver is behind the wheel.

3.   More than half have driving curfews for teens.

4.   Some states are trying to address the problem, with more than half having driving curfews for teens.

5.   Twenty-eight states have driving curfews, most of them beginning at midnight.