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Stack interchange. A directional interchange, colloquially known as a stack interchange, is a type of grade-separated junction between two controlled-access highways that allows for free-flowing movement to and from all directions of traffic. These interchanges eliminate the problems of weaving, have the highest vehicle capacity, and vehicles ...
A cloverleaf interchange is a two-level interchange in which all turns are handled by slip roads. To go left (in right-hand traffic; reverse directions in left-driving regions), vehicles first continue as one road passes over or under the other, then exit right onto a one-way three-fourths loop ramp (270°) and merge onto the intersecting road. The objective of a cloverleaf is to allow two ...
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 ...
Exit numbers in the United States are assigned to freeway junctions, and are usually numbered as exits from freeways. Exit numbers generally are found above the destinations and route number (s) at the exit, as well as a sign in the gore. Exit numbers typically reset at political borders such as state lines.
A reversible lane (or tidal flow) is a managed lane in which traffic may travel in either direction, depending on certain conditions. Typically, it is meant to improve traffic flow during rush hours, by having overhead traffic lights and lighted street signs notifying drivers which lanes are open or closed to driving or turning.
The Golden State Freeway then rises sharply, passing by Lake Castaic and undergoing a unique crossover resulting in a left-driving configuration for about 5 mi (8.0 km) before the highway crosses back into its standard alignment.
Single-point urban interchange Schematic of a freeway-under SPUI where traffic drives on the right. Traffic entering the freeway is in red. Traffic exiting the freeway is in green. Through traffic is in gray. All traffic motion of the same color can proceed simultaneously.
Learn about the history, design, and meaning of road signs in the United States, from regulatory to historic markers.
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