Abstract
The in- depth investigations of two studies involving 1200 motorcycle accidents in Los Angeles were merged and analyzed for factors associated with alcohol, involvement in motorcyclists and vehicle drivers who collided with motorcycles.A variety of factors converge around alcohol use to increase the likelihood of severe injury and death in alcohol related motorcycle accidents. Motorcycle riders who drank where more prone to operator error to simply run off the road, to crash at higher speeds and less likely to have worn a helmet, hence more likely to be fatally injured than nondrinking motorcyclists.