Partial Cloverleaf Interchange - Freeway-to-freeway Interchanges

Freeway-to-freeway Interchanges

In the late 1960s, there were parclo designs modified for freeway traffic. The ramps are longer to allow for higher speeds, particularly the loop ramp radii, which are enlarged to allow a recommended 40 km/h (25 mph) instead of 30 km/h (19 mph). In a right-hand traffic (RHT) system, the signalized left turn is eliminated by an underpass or overpass.

Examples include the Highway 401-404 junction, and the former interchange between I-635 and US 75, the latter which has since been replaced by a five-level stack.