Which of the following blocks the smooth flow of traffic?

Driving with your windows open.
Avoiding unnecessary lane changes.
Slowing down to look at a collision scene.
Using public transportation instead of your vehicle.
Explanation

When drivers reduce their speed to view an accident, it can create delays and cause traffic to back up, making it more difficult for emergency vehicles to reach the scene and for other drivers to continue moving efficiently. To help maintain traffic flow and ensure that those injured receive prompt assistance, avoid slowing down to look at a collision scene.

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This question appears in the following DMV practice tests: