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A diverging diamond interchange (DDI), also called a double crossover diamond interchange (DCD), [1][2] is a subset of diamond interchange in which the opposing directions of travel on the non- freeway road cross each other on either side of the interchange so that traffic crossing the freeway on the overpass or underpass is operating on the ...
Beginning. The first cloverleaf interchange built in the United States was the Woodbridge Cloverleaf [5] at intersection of the Lincoln Highway (Route 25) and Amboy —now St. Georges—Avenue (Route 4) (now U.S. 1/9 and Route 35) in Woodbridge Township, New Jersey. [6][7][8] It opened in 1929, [9] although it has since been replaced with a ...
A typical freeway-over SPUI. This example, near Orlando, has since been demolished. California State Route 87 at Taylor Street, a freeway-under SPUI. A SPUI is similar in form to a diamond interchange but has the advantage of allowing opposing left turns to proceed simultaneously by compressing the two intersections of a diamond into one single intersection over or under the free-flowing road.
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 ...
Reversible lane. The south end of Lions Gate Bridge in Vancouver, British Columbia. 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 ...
A free-flow interchange is an interchange in which all roads are grade-separated, and where movement from one road to another does not require the driver to stop for traffic (for example, the interchange may not include traffic lights or unsignalized at-grade intersections ). Free-flow interchanges are less likely to induce traffic congestion ...
In the United States, where this form of interchange is very common, particularly in rural areas, traffic on the off-ramp typically faces a stop sign at the minor road, while traffic turning onto the freeway is unrestricted. The diamond interchange uses less space than most types of freeway interchange, and avoids the interweaving traffic flows ...
Meters on freeway onramps are ubiquitous in Los Angeles. As is traffic congestion. A state engineer explains how the meters are helping traffic, even if you don't notice an improvement.
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