A superstreet is a type of road intersection which is a variation of the Michigan left. In this configuration, traffic on the minor road is not permitted to proceed straight across the major road or highway; traffic wishing to turn left or go straight must turn right onto the major road, make a U-turn through the median a short distance away from the intersection and then either go straight or make a right turn when it intersects the other half of the minor street.
This requires four lighted intersections, and most traffic must pass through two of them, but each light has only two phases, greatly increasing average traffic flow; there is no need for numerous left-turn phases where most traffic is waiting for only a few cars to clear the intersection.
This description assumes driving on the right.
External links
- Federal Highway Administration, Alternative Intersection Treatments - Superstreet Median Crossover
- North Carolina DOT - proposed superstreet in Chapel Hill (note: this project does not include the left turns from the main road)
- Brunswick Beacon article Superstreet considered for U.S. 17
- Google aerial photograph of a Superstreet in Troy, MI, near the Somerset Collection
- Proposal for a superstreet on U.S. 281 in San Antonio, including detailed illustrations of the various traffic flows.
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