Multi-car accidents are chain-reaction collisions that can result from many different circumstances.  Some of the most common triggers of chain reaction pile-ups include:
Rear-End Collisions - A chain-reaction crash can start with a simple rear-end accident, which causes each car to slam into the car ahead of it.
Bad Weather & Dangerous Road Conditions - Many multi-car collisions occur during inclement weather such as heavy rain, fog, or other natural elements that heighten the risk of driving. Difficult weather conditions cause poor visibility and slippery roads that make a pile-up crash far more likely.
Reckless Drivers - Reckless driving, including speeding, sudden stops, and tailgating, can lead to a chain reaction pileup event.
Distracted & Negligent Drivers - Distracted driving often leads drivers to make unsafe mistakes such as unsafe lane changes on a freeway without checking their blind spots, and can unintentionally set off a chain reaction of collisions.
Drowsy Driving - Drowsy drivers who fall asleep, even for a split second, are likely to lose control of their cars and drift into other lanes or even oncoming traffic.
Drunk Driving - Intoxicated drivers and drivers under the influence of drugs are likely to drive recklessly and at dangerously high speeds, which may trigger a multi-vehicle accident.
Defective Auto Parts - defective or worn down auto parts can lead to brake failure, initiating multi-car collisions.