Four-ramp interchange

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.