Operation

Because the intersection on a village road would be congested with movements from and to all directions, a different road would be needed for turning vehicles. Therefore, only pedestrians and straight-going vehicles are allowed to pass through the center of the intersection.

normal intersection on a village road

Straight-going vehicles move like in a highway intersection. In order to avoid interference with pedestrians, turning vehicles have a separate road. Left-turning vehicles turn 270 degrees in a clockwise direction. Right-turning vehicles turn as if they were in an expressway.

the intersection with separate roads for turning

This picture shows the original design of a cloverleaf interchange which had 2 levels:

2-level cloverleaf interchange

The cloverleaf is simply a normal intersection with separate roads for turning. Just like the C.F.I. and D.D.I., this traffic system has only 1 level.

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Definition

The cloverleaf interchange (or simply cloverleaf) is an unusual traffic system where turning vehicles pass through a different road! This system allows simultaneous movements with the straight-going vehicles. It also eliminates the 2 cycles for turning. With the cloverleaf for intersections on village roads, there would be only 2 cycles. Each of these cycles will have straight and turning movements at the same time.

1st cycle

2nd cycle