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Single-Point Urban Interchange (SPUI)

A completed SPUI interchange at US-131 and 44th Street in city of Wyoming, Kent County.
Department of Transportation

Single-Point Urban Interchange (SPUI)

A Single-Point Urban Interchange (SPUI) is a type of highway interchange. In a SPUI (pronounced "Spooey"), a single traffic signal at the center of the interchange controls all left turns. Drivers make opposing left-turns at the same time under the protection of this signal.


  • Constructed where there is not enough room for a standard interchange.
  • Ideal for urban areas.
  • Allows more vehicles to make a turn and clear the interchange in one traffic signal cycle.
  • Allows long, gradual turns so larger vehicles have more room to navigate the interchange.
  • It can be coordinated with cross-street signal systems.