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Contraflow lane reversal is the altering of the normal flow of traffic, typically on a controlled-access highway (such as a freeway or motorway), to either aid in an emergency evacuation (the most common usage of the term in the United States) or, as part of routine maintenance activities, to facilitate widening or reconstruction of one of the highway's carriageways (the most common usage in ...
However, due to its dual spans, when there are 2 eastbound lanes and 3 westbound the opposing sides are completely divided, this is the usual configuration. Hanover Street Bridge in Baltimore has 5 lanes total marked reversible, with 1 usually reversed for normal peak traffic). Georgia Avenue in Silver Spring has 7 lanes.
The following junction types typically permit U-turns but are not designed specifically for that purpose. Normal at-grade intersections on divided highways often allow traffic traveling on the divided highway to perform a U-turn, often when there is a green light for traffic turning onto the side road, crossing the opposing lanes (left turns in countries where traffic drives on the right ...
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The design is intended to provide a guide for drivers to maintain a safe distance between vehicles. Road signs can be found along motorways, to indicate the safe distance (1 line = too close, 2 lines = safe distance). At some points (tunnel, bridge, narrow road with no shoulder, tight curve) the edge line becomes solid.
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Allowing exiting traffic to re-enter the through road in the same direction requires leaving the interchange on the local road and turning around, e.g., via a median U-turn crossover. This affects several use cases: [41] Drivers who take the wrong exit; Bypassing a crash at the bridge; Allowing an oversize load to bypass a low bridge