It is very important to check behind you before you:
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Drive down a steep hill.
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Change lanes.
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Reduce your speed.
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All of the above.
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Explanation
It is important to check behind you to ensure there are no vehicles in your blind spot when changing lanes, to avoid causing sudden stops for vehicles behind you when reducing speed, and to be aware of traffic when driving down a steep hill.
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This question appears in the following DMV practice tests: