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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.
One of the examples in Asia includes the Clark South exit in SCTEX, which is a two quadrant parclo interchange. Depending on traffic and land needs, hybrid designs, such as the parclo AB and parclo A3, can be created. A notable example of a parclo AB interchange includes the Highway 417 and the Woodroffe Avenue interchange in Ottawa. Other ...
The cloverleaf interchange between US 131, M-6 and 68th Street in Cutlerville, Michigan, United States, shows many of the features of controlled-access highways: entry and exit ramps, median strips for opposing traffic, no at-grade intersections and no direct access to properties.
A cloverleaf interchange is a four-legged junction where left turns across opposing traffic are handled by non-directional loop ramps. [23] It is named for its appearance from above, which resembles a four-leaf clover. [21] A cloverleaf is the minimum interchange required for a four-legged system interchange.
PA 283 meets Vine Street at a partial cloverleaf interchange in a business area; Vine Street provides access to the borough of Middletown to the south and the borough of Hummelstown to the north. Past this interchange, the freeway curves south-southeast through wooded areas with some fields and homes, passing over I-76 (Pennsylvania Turnpike).
A two-level interchange in which turns are handled by eight total ramp or slip roads, four of which form loops that give the interchange the shape of a cloverleaf from the air. Each ramp allows traffic from one direction of a roadway to access only one direction of the crossroad: e.g. from northbound to eastbound while a separate ramp connects ...
An example of the potential complexity of grade separation, seen in the Jane Byrne Interchange in Chicago Seven various overpasses for grade separation in Spain near Barcelona Rail-rail grade separation in Xiaoshan, China The concept of grade separation includes all transport modes, such as a simple pedestrian bridge over rail tracks.
Between February 2006 and November 2008, the cloverleaf interchange with Route 35 in Woodbridge, the first in the U.S. built in 1929 when this portion of US 1/9 was a part of Route 25, was replaced with a partial cloverleaf interchange, costing $34 million (equivalent to $47.3 million in 2023 [30]). [31] [32] [33]