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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 ...
A single-point urban interchange (SPUI, / ˈ s p uː i / SPOO-ee or / ˈ s p juː i / SPEW-ee), also called a single-point interchange (SPI) [1] or single-point diamond interchange (SPDI), is a type of highway interchange. The design was created in order to help move large volumes of traffic through limited amounts of space efficiently.
An overpass, called an overbridge or flyover (for a road only) in the United Kingdom and some other Commonwealth countries, is a bridge, road, railway or similar structure that is over another road or railway. An overpass and underpass together form a grade separation. [1] Stack interchanges are made up of several overpasses.
In civil engineering, clearance refers to the difference between the loading gauge and the structure gauge in the case of railroad cars or trams, or the difference between the size of any vehicle and the width/height of doors, the width/height of an overpass or the diameter of a tunnel as well as the air draft under a bridge, the width of a lock or diameter of a tunnel in the case of watercraft.
A roundabout interchange is a type of interchange between a controlled access highway, such as a motorway or freeway, and a minor road. The slip roads to and from the motorway carriageways converge at a single roundabout , which is grade-separated from the motorway lanes with bridges.
The first cloverleaf interchange patented in the US was by Arthur Hale, a civil engineer in Maryland, on February 29, 1916. [3] [4]A modified cloverleaf, with the adjacent ramps joined into a single two-way road, was planned in 1927 for the interchange between Lake Shore Drive and Irving Park Road in Chicago, Illinois, but a diamond interchange was built instead.
The cost of repairing the bridge, damaged over the highway's northbound lanes, is estimated at $500,000 to $1 million, according to a bid invitation the state issued this week.
The project, slated to cost $1.8 billion overall, was the largest single infrastructure project in the history of Saskatchewan. [4] The bypass is owned on behalf of the public by the Ministry of Highways and Infrastructure with design, construction, operations, and long-term maintenance performed by the Regina Bypass Partners.