When a motor vehicle strikes a tree while traveling at 40 mph, the unrestrained occupant remains in motion until acted upon by an external force. Approximately 20% of car accident fatalities are caused by motor vehicles getting off the road and hitting fixed objects alongside the road.
Trees, utility poles, and traffic barriers are the most commonly hit objects. Drivers also get off the road due to over speeding, falling asleep, carelessness, or poor visibility. Fixed object collision data shows that the most fatal event by motor vehicles is coded as a stationary object collision.
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