Partial cloverleaf interchange

It has also been used occasionally in some European countries, such as Germany, Hungary, Italy, the Netherlands, and the United Kingdom.

The parclo A2 and B2 are commonly used on rural freeways such as Highway 402 and Highway 416, where the ramps can be added without widening the street overpass/underpass to include deceleration lanes (normally needed on the A4 in order to safely enter the loop ramps that lead to the freeway).

The parclo A2 and B2 ramps are also usually longer and allow for higher speeds than their A4 counterparts because of rural land availability.

Some parclos have the right-turning (directional) on-ramp leave the arterial road after the exit ramp intersection.

These exit ramps are also frequently multi-laned to accommodate traffic turning left, right, or going straight ahead in some cases.

At least four B4 designs are known to exist in Kentucky: The US 83 interchange on I-80 in North Platte, Nebraska, has also recently been upgraded to a B4 from a diamond.

Sometimes the ramps in a folded diamond are actually local streets; surface roads upgraded to higher standards often do this to save money on land acquisition.

This type of interchange long predates the parclo; the Merritt Parkway and Queen Elizabeth Way, both built in the 1930s, used mainly folded diamonds and cloverleaves.

One of the examples in Asia includes the Clark South exit in SCTEX, which is a two quadrant parclo interchange.

In the United States, folded diamonds are frequently used in interchanges with roads that have a railroad line closely paralleling the surface street; entrance/exit ramps are not permitted to have level crossings in modern American practice.

The configuration of parclo interchanges allows for the consolidation of toll barriers at points where onramps and offramps run alongside each other.

A single large barrier can serve each onramp/offramp pair simultaneously, reducing construction and operation expenses at through junctions.

When possible, such as at terminal junctions, trumpet interchanges are preferred since they only require one large toll barrier for all four on/off-ramps.