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Contraflow lane reversal is the altering of the normal flow of traffic, typically on a controlled-access highway , to either aid in an emergency evacuation or, as part of routine maintenance activities, to facilitate widening or reconstruction of one of the highway's carriageways.
Usually, the term is used to refer to reversal of lanes which are normally configured for travel in one direction; routinely changing the configuration of reversible lanes is not normally considered contraflow lane reversal.
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