* Driver Distraction: This is arguably the most significant contributor. This includes anything that takes a driver's attention away from the road, such as:
* Cell phone use: Texting, talking on the phone (hands-free or otherwise).
* Eating and drinking.
* Adjusting the radio or GPS.
* Interacting with passengers.
* Daydreaming or being otherwise inattentive.
* Speeding: Excessive speed reduces reaction time and increases the severity of impact in a collision.
* Drunk Driving (DUI/DWI): Impaired driving significantly impairs judgment, reaction time, and coordination, leading to a high risk of accidents.
* Following Too Close (Tailgating): Leaving insufficient distance between vehicles prevents adequate reaction time to avoid collisions, especially in stop-and-go traffic.
* Drowsy Driving: Driving while fatigued significantly reduces cognitive function and reaction time, making accidents more likely.
* Road Rage: Aggressive driving behaviors, such as speeding, tailgating, and cutting off other drivers, increase the risk of accidents.
* Adverse Weather Conditions: Rain, snow, ice, and fog significantly reduce visibility and traction, making driving more challenging and increasing the likelihood of accidents.
* Poor Road Conditions: Potholes, uneven surfaces, and inadequate road markings can contribute to accidents.
It's important to note that these factors often interact. For example, a driver distracted by their cell phone might also be speeding, leading to a more severe accident. Data on the precise ranking of these causes can vary slightly depending on the source and year, but these consistently appear near the top of the list.
