Aggressive driving is defined by the National Highway Traffic Safety Administration as the behaviour of an individual who "commits a combination of moving traffic offences so as to endanger other persons or property." 
Behaviours associated with aggressive driving
The U.S. National Highway Traffic Safety Administration (NHTSA) has implemented the Fatality Analysis Reporting System,  which identifies actions that would fall under the category of aggressive driving, including:
- Following improperly / tailgating.
- Improper or erratic lane changing 
- Illegal driving on road shoulder, in ditch, or on sidewalk or median.
- Passing where prohibited.
- Operating the vehicle in an erratic, reckless, careless, or negligent manner or suddenly changing speeds.
- Failure to yield right of way.
- Failure to obey traffic signs, traffic control devices, or traffic officers, failure to observe safety zone traffic laws.
- Failure to observe warnings or instructions on vehicle displaying them.
- Failure to signal.
- Driving too fast for conditions or in excess of posted speed limit.
- Making an improper turn.
Impacts of aggressive driving
According to the Fatality Analysis Reporting System, aggressive driving played a role in 56% of fatal crashes between 2003 and 2007, most of which were attributed to excessive speed.
- "Aggressive Driving | National Highway Traffic Safety Administration (NHTSA)". www.nhtsa.gov. Retrieved 2016-03-08.
- "Fatality Analysis Reporting System (FARS) | National Highway Traffic Safety Administration (NHTSA)". www.nhtsa.gov. Retrieved 2016-03-08.
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