A few stats from 1997 (NHTSA)

Per vehicle mile traveled, motorcyclists were about 15 times as likely as passenger car occupants to die in a motor vehicle traffic crash and about 3 times as likely to be injured.

But,

In 1997, 41 percent of all motorcycle drivers involved in fatal crashes were speeding. The percentage of speeding involvement in fatal crashes was approximately twice as high for motorcyclists as for drivers of passenger cars or light trucks, and the percentage of alcohol involvement was more than 50 percent higher for motorcyclists.

Nearly one out of five motorcycle operators (18 percent) involved in fatal crashes in 1997 were operating the vehicle with an invalid license at the time of the collision.

Motorcycle operators involved in fatal crashes in 1997 had higher intoxication rates (BAC of 0.10 g/dl or greater) than any other type of motor vehicle driver. The intoxication rate for motorcycle operators involved in fatal crashes was 27.9 percent.