Drivers should check their rearview mirrors:
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Only when changing lanes.
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Often to see how traffic is moving behind them.
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Only when slowing down.
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To see if a truck is in their blind spot.
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Explanation
Checking your rearview mirror is important to ensure you are aware of the position of vehicles behind you. This will help you to anticipate any sudden or unexpected movements of the vehicles behind you, such as if a vehicle is tailgating or moving up quickly. Checking your rearview mirror allows you to be aware of any potential hazards and react accordingly in a timely manner. Check your rearview mirror when backing up, changing lanes, slowing down quickly, or driving down a steep hill.
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