The United States experienced a remarkable reduction in alcohol related fatal crashes. An analysis of fatal crash data estimated that five basic alcohol safety laws accounted for 44% of the reduction in fatal crashes. This analysis included data from the Fatality Analysis Reporting System (FARS), which collects data on all fatal crashes occurring in the United States and is maintained by the NHTSA, as well as data from several other sources to account for factors such as age, gender, per capita alcohol consumption, time of day and day of the week the crash occurred, presence of important impaired driving laws, and the level of impaired driving enforcement that might moderate the influence of BAC on crashes.