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The windmill interchange is a four-way road interchange.
The windmill serves two arterial roadways by grade separation. All turning movements are served by a right-hand exit ramp, with stop sign or traffic signal at the ramp termini.
Vehicles make right and left-turn movements at the ramp intersections and are removed from the main intersection in conventional intersection design. Left turns can turn into left merge lanes, so vehicles have to wait gaps in arterial traffic in only one direction (similar to the Continuous Green T-intersection operations.)
This application is best suited for locations where free-flow through movements are desired for both intersecting roadways, with moderate to low turning movement volumes.
This interchange design is best suited for rural locations where ROW is available at the intersection quadrants and quadrant development is low to minimize attraction of turning movement volumes.
- Location of a Windmill near Jackson, OH