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What is a Superstreet?
The Superstreet concept refers to a reconfiguration of a traditional intersection. Simply put, it is a method to safely and
efficiently manage high traffic volumes at intersections with multiple approaches along a divided highway. The primary Superstreet
concept functions by redirecting through and left turning traffic from the side street approach to turn right, proceed to the nearby
U-turn and then return to its original course. At first, this may seem to be a complex solution to a very simple objective – to cross
the intersection or to make a left turn. However, when designed correctly, is actually a simple and safe solution to the problems caused
by congestion.
- The minor cross-street traffic is prohibited from going straight through or left at a divided highway intersection.
- Minor cross street traffic must turn right, but can then access a U-turn to proceed in the desired direction.
Unsignalized vs. Signaled
Superstreet intersections can be unsignalized, partially signalized, or fully signalized. The use of signals is determined on a case-by-case basis,
depending on a number of roadway characteristics such as traffic volume, sight distance, crash history and roadway layout. Typically, superstreets in
rural areas will not have signals, while those in urban and suburban areas may have up to four signalized intersections within the superstreet layout (two
at each of the intersections with the side street and two at the u-turn locations).
Documents
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NCDOT
NCSMARTLINK
NCGOV
