Speed is one factor but not everything: - Speeding - Driving under the influence of alcohol and other psychoactive substances - Nonuse of motorcycle helmets,

Speed is one factor but not everything: - Speeding - Driving under the influence of alcohol and other psychoactive substances - Nonuse of motorcycle helmets, seat-belts, and child restraints - Distracted driving - Unsafe road infrastructure - Unsafe vehicles - Inadequate post-crash care - Inadequate law enforcement of traffic laws