Innovative Intersections and Interchanges

 

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Restricted Crossing U-Turn (RCUT) icon
Innovative Intersection: Restricted Crossing U-Turn (RCUT)
Highway 9 East at Liberty Church Road, Loris, S.C.

An RCUT is also known as:

  • Superstreet intersection
  • J-turn intersection
  • Reduced conflict intersection (RCI)
  • Synchronized street intersection

What Is An RCUT?

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  • Intersection design where all side street movements begin with a right turn
  • Side street left-turn and through vehicles turn right and make a U-turn at a dedicated downstream median opening to complete the desired movement
  • Main intersection and median U-turns can be designed as signalized, stop controlled or yield controlled






When Should It Be Considered?

  • On median-divided highways
  • At intersections:
    • With heavy through and / or left-turn traffic volumes on the major street
    • With low through and left-turn traffic volumes on the side street
    • With three or four legs

Benefits

  • Improved safety: Reduces the number of points where vehicles cross paths and eliminates the potential for head-on crashes
  • Increased efficiency: Each direction of the major street can operate independently, creating two one-way streets and increasing the overall intersection capacity
  • Shorter wait times: Fewer traffic signal phases means less stopping for arterial vehicles and allowing only right turns from side street vehicles means less waiting
  • Cost-effective: An RCUT can be more cost effective than adding lanes to improve capacity

How to Navigate

Below is how to navigate an RCUT. Click the image to view a larger version or watch the video.

RCUT navigation diagram

Conflict Points

The number of conflict points (locations where vehicle travel paths intersect) is one metric that can be used to evaluate the safety of an innovative intersection or interchange.

There are three categories: crossing, merging or diverging.

In general, merging and diverging conflict points — where vehicles are moving in the same direction — are associated with less severe crash types than crossing conflict points where vehicles are moving in opposite directions.

The diagrams below compare the possible vehicle travel movements and associated conflict points at a conventional four-leg intersection to an RCUT.

These diagrams represent a general case, with one travel lane in each direction, and do not take into account pedestrian or bicycle movements at an intersection or interchange.

When compared to a conventional four-leg intersection, an RCUT has 14 fewer crossing conflict points.

Conventional Intersection: Conflict Points

Conflict Point Diagram

RCUT: Conflict Points

Resources

From the Virginia Department of Transportation

From the Federal Highway Administration

Also

Page last modified: Nov. 7, 2019