Collisions can happen more often when:

One lane of traffic is traveling faster than the others.
All vehicles are traveling at the posted speed limit.
One vehicle is traveling faster than the flow of traffic.
All of the above.
Explanation

Excessive speed, particularly when a vehicle is traveling faster than the surrounding traffic, significantly increases the risk of collisions. It disrupts the smooth flow of vehicles, making it challenging for drivers to anticipate and react to changing road conditions. Speeding reduces the driver's ability to maneuver safely, extends the braking distance, and escalates the severity of collisions.

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