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A traffic collision, also called a motor vehicle collision (car crash in case cars are involved in the collision), occurs when a vehicle collides with another vehicle, pedestrian, animal, road debris, or other moving or stationary obstruction, such as a tree, pole or building. Traffic collisions often result in injury, disability, death, and property damage as well as financial costs to both society and the individuals involved. Road transport is the most dangerous situation people deal with on a daily basis, but casualty figures from such incidents attract less media attention than other, less frequent types of tragedy. The commonly used term car accident is increasingly falling out of favor with many government departments and organizations, with the Associated Press style guide recommending caution before using the term.A number of factors contribute to the risk of collisions, including vehicle design, speed of operation, road design, weather, road environment, driving skills, impairment due to alcohol or drugs, and behavior, notably aggressive driving, distracted driving, speeding and street racing.Criticism of "accident" terminology
Many organizations, companies, and local, state, and federal departments have begun to avoid the term accident, instead preferring terms such as collision, crash or incident. This is because the term accident may imply that there is no one to blame or that the collision was unavoidable, whereas most traffic collisions are the result of driving under the influence, excessive speed, distractions such as mobile phones or other risky behavior, poor road design, or other preventable factors. In 1997, George L. Reagle, the Associate Administrator for Motor Carriers of the Federal Motor Carrier Safety Administration wrote a letter stating that "A crash is not an accident", emphasizing that the Department's Research and Special Programs Administration, the Federal Highway Administration, and the National Highway Traffic Safety Administration had all declared that "accident" should be avoided in their published writings and media communications. In 2016, the Associated Press updated their style guide to recommend that journalists use "crash, collision, or other terms" rather than "accident", unless culpability is proven. The AP also recommends avoiding "accident" when negligence is proven or claimed because the term "can be read as exonerating the person responsible." In 2021, the American Automobile Association (AAA) passed a resolution to replace "car accident" with "car crash" in their vocabulary. In 2022, the traffic management company INRIX announced that "accident" would be removed from their lexicon.The Maryland Department of Transportation's Highway Safety Office emphasizes that "crashes are no accident", saying that "Using the word accident suggests that an incident was unavoidable, but many roadway crashes can be attributed to human error." The Michigan Department of Transportation states that "accident" should be dropped in favor of "crash", saying that "Traffic crashes are fixable problems, caused by inattentive drivers and driver behavior. They are NOT accidents."  In line with their Vision Zero commitments, the Portland Bureau of Transportation recommends using "crash" rather than "accident".Historically, in the United States, the use of terms other than accident had been criticized for holding back safety improvements, based on the idea that a culture of blame may discourage the involved parties from fully disclosing the facts, and thus frustrate attempts to address the real root causes.Combinations of factors
Several conditions can combine to create a much worse situation, for example:
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