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U.S. Highways Pivot From Roundabouts to RCUT and Diverging‑Diamond Designs

U.S. transportation data indicate sizable crash reductions as agencies expand these layouts to cut conflict points and keep traffic moving.

Overview

  • Restricted Crossing U‑Turn (RCUT) intersections reroute side‑road traffic to turn right then make a downstream U‑turn, removing direct left turns and perpendicular crossings tied to severe crashes.
  • Federal Highway Administration findings cited in the coverage report injury crashes can fall by up to 70% where RCUTs are installed.
  • Displaced or diverging‑diamond configurations shift lanes before the junction so left turns proceed without crossing opposing traffic, reducing delays and congestion.
  • Cities including Kansas City, Salt Lake City and Charlotte report smoother flow and, in some cases, crash reductions of up to about 50% after adopting these designs.
  • Wider rollout requires significant upfront investment, clear signage and driver education, and Argentina has not yet implemented these U.S. models at scale despite interest in their safety benefits.