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Other Innovative Intersections

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Motorists, pedestrians, and bicyclists face greater mobility challenges and safety risks at intersections as traffic volumes grow and congestion worsens. Agencies need safer, more balanced designs that keep people moving. Innovative intersection designs offer many safety and operational benefits, and are being built more often because they can deliver more for less. Continuous Green T, Offset T, Quadrant Roadway and Jughandle designs are a few innovative designs in use in a small number of states, and have shown promise in reducing crashes and improving operations.

There are other innovative designs as well – including many that are only schematic concepts at this time. The common characteristic across all types of innovative intersection designs is the reduction in the number and severity of conflict points. The diagram below illustrates the difference in conflict points between a conventional, four-legged intersection, an equivalent Quadrant Roadway design and an equivalent Offset T design. There are 32 conflict points associated with a conventional intersection – 8 merging (or joining), 8 diverging (or separating) and 16 crossing.

Vehicle-Vehicle
Conflict Points
Conventional
Intersection
Quadrant Roadway Offset T
Chart Legend: Black circle = Crossing, gray circle =Merging and white circle =Diverging Diagram: Diagram: Diagram:
Crossing 16 8 6
Merging 8 10 6
Diverging 8 10 6
Total 32 28 18

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Outreach and Education

To help explain the concepts and raise awareness about additional innovative geometric designs, the following resources were prepared by FHWA:

Technical Materials

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Other Resources

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State & Federal Research

National Partners

Page last modified on February 1, 2017
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