Unless otherwise posted, the speed limit on highways with four lanes is:
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70 mph.
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35 mph.
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55 mph.
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65 mph.
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Explanation
Unless otherwise posted, if you are driving on a four-lane highway, you should not exceed 65 mph. Regardless of the posted speed limit, you should adjust your speed for weather conditions and match the flow of traffic, as long as it does not exceed the posted speed limit.
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