You should always turn on your emergency flashers when:

Your vehicle has broken down on the roadway.
You plan to turn at the next intersection.
You stop near a curb painted red.
You are driving in heavy fog.
Explanation

Emergency flashers are important because they make you more visible to other drivers. Turning on your emergency flashers allows other drivers to know that you are having vehicle trouble, so that they have time to change lanes and slow down. Emergency flashers are also important when your vehicle has broken down on the roadway, or when you are stopped on the side of the road, as they make your vehicle more easily visible from behind.

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