Four-ramp interchange

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A diagram of a diamond interchange, the most common kind of four-ramp interchange. All traffic attempting to enter the blue highway northbound will enter via ramp 'X.'

A four-ramp interchange is the most common interchange in the United States where a non controlled access highway intersects a controlled access highway: commonly an interstate/turnpike or other type of freeway.

Four-ramp interchanges are desirable for hitchikers because they require all traffic attempting to head a given direction on a freeway to enter the freeway on a single ramp. The hitchhiker stands on this ramp and is then exposed to all possible traffic entering the freeway. This is in contrast to a split-traffic interchange which splits traffic entering the freeway into multiple ramps.