Car accidents are damaging events involving road traffic, particularly automobiles. They can cause damage to vehicles, people or structures. Car accidents — also called traffic collisions, auto accidents, road accidents, personal injury collisions, motor vehicle accidents, and (particularly by American radio traffic reporters) crashes — kill an estimated 1.2 million people worldwide each year, and injure about forty times this number (WHO, 2004). The term "accident" is considered inappropriate by some, as reliable sources estimate that upwards of 90% are the result of driver negligence.