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-quarter loop ramp (270°) and merge onto the intersecting road. The objective of a cloverleaf is to allow two highways to cross without the need for any traffic to be stopped by traffic lights. The limiting factor in the capacity of a cloverleaf interchange is traffic weaving.
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In this Dossier
Cloverleaf interchange in the context of Controlled-access highway
A controlled-access highway is a type of highway that has been designed for high-speed vehicular traffic, with all traffic flow—ingress and egress—regulated. Common English terms are freeway, motorway, and expressway. Other similar terms include throughway or thruway and parkway. Some of these may be limited-access highways, although this term can also refer to a class of highways with somewhat less isolation from other traffic.
In countries following the Vienna convention, the motorway qualification implies that walking and parking are forbidden.
Cloverleaf interchange in the context of Zero Point Interchange
Zero Point Interchange is a large cloverleaf interchange in Islamabad, Pakistan. It is located at the intersection of Islamabad Highway, Srinagar Highway, and Khayaban-e-Suharwardy. It was inaugurated in 5 July 2011, and has an estimated life of 30 years.
Cloverleaf interchange in the context of Meadowbrook State Parkway
The Meadowbrook State Parkway (also known as the Meadowbrook, the Meadowbrook Parkway, Meadowbrook Causeway, or the MSP) is a 12.52-mile (20.15 km) controlled-access parkway in Nassau County, New York, in the United States. Its southern terminus is at a full cloverleaf interchange with the Bay and Ocean parkways in Jones Beach State Park. The parkway heads north, crossing South Oyster Bay and intersecting Loop Parkway before crossing onto the mainland and connecting to the Southern State Parkway in North Merrick. It continues north to the hamlet of Carle Place, where the Meadowbrook Parkway ends at exit 31A of the Northern State Parkway. The Meadowbrook Parkway is designated New York State Route 908E (NY 908E), an unsigned reference route. Most of the road is limited to non-commercial traffic, like most parkways in the state of New York; however, the portion south of Merrick Road is open to commercial traffic.
The Meadowbrook State Parkway was first envisioned in 1924 as part of the Long Island State Park Commission (LISPC) and Robert Moses's system to connect several parks in Nassau and Suffolk counties. One park included in the proposal was Jones Beach State Park, which opened along with the Ocean Parkway in 1929. Construction of the Meadowbrook and Loop causeways began in July 1933, and was slated for completion in January 1935. The Reconstruction Finance Corporation loaned $5,050,000 toward the project, which was completed in October 1934. Nassau County acquired the right-of-way for an extension to the Northern State Parkway in 1936, and the highway was originally intended to be finished for the 1939 World's Fair in Flushing Meadows, Queens. The start of construction was ultimately delayed until December 1953, and the $10 million (1953 USD) highway was completed in October 1956.