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superstreet
A superstreet, also known as a restricted crossing U-turn (RCUT), J-turn, or Reduced Conflict Intersection,〔Minnesota Department of Transportation, (Reduced Conflict Intersections ), accessed November 2014〕 is a type of road intersection that 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. Drivers wishing to turn left or go straight must turn right onto the major road, then, a short distance away, queue (wait) into a designated U-turn (or crossover) lane in the median. When traffic clears they complete the U-turn and then either go straight or make a right turn when they intersect the other half of the minor road.
This requires four traffic light-controlled 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.
==Practicality==
Superstreets are not very common because they require substantial Right of Way to provide a median that can accommodate truck traffic. Inconvenience to traffic on the minor road is mostly a perception issue and does not represent additional delay in most cases. However, superstreets are cheaper than limited access freeways with interchanges and help traffic on the major road.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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