Young female drivers, under age 50, have a lower fatality rate than their male counterparts, on a per mile driven basis, while the rate is essentially the same for both male and female drivers over 50 years of age. Helmets are estimated to be 29 percent effective in preventing fatalities among motorcyclists. This is the legal limit of intoxication in most states. The severity of a crash increases with alcohol involvement. For young drivers 15 to 20 years old, alcohol involvement is higher among males than among females.
Drivers are less likely to use restraints when they have been drinking.