Partial cloverleaf interchange
A partial cloverleaf interchange or parclo is a modification of a cloverleaf interchange.
A parclo A4 type interchange on the Highway 407 Electronic Toll Route in Ontario 43°34′18″N 79°47′24″W / 43.571623°N 79.789925°W / 43.571623; -79.789925
A five-ramp parclo in British Columbia, Canada 49°19′29″N 124°26′29″W / 49.324786°N 124.441373°W / 49.324786; -124.441373
An aerial view of a parclo B2 featuring roundabouts connecting Highway 5 and Matkus Shopping Center in Kuopio, Finland. 62°49′16″N 27°36′40″E / 62.82111°N 27.61111°E / 62.82111; 27.61111
An A4 parclo at Saskatchewan Highway 1 (the Trans Canada Highway), Saskatchewan Highway 39 and Saskatchewan Highway 301. The eastbound directional onramp is located further south of the overpass and is not pictured.
A cloverleaf interchange is a two-level interchange in which all turns are handled by slip roads. To go left, 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 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.
A typical cloverleaf interchange with collector/distributor roads in Cutlerville, Michigan, located at: 42°50′56″N 85°40′43″W / 42.848912°N 85.678689°W / 42.848912; -85.678689
The Kathipara Cloverleaf interchange in Chennai, India
Many old cloverleaf interchanges elongate the ramps in the direction of the surface road. This one in Alhambra, California has been supplemented with collector/distributor roads, 34°04′18″N 118°07′23″W / 34.071659°N 118.122938°W / 34.071659; -118.122938
Opening Europe's first cloverleaf (October 1935) at Slussen, Stockholm, 59°19′14″N 18°04′21″E / 59.32063°N 18.072501°E / 59.32063; 18.072501
