Single-point urban interchange

Schematic of a freeway-under SPUI where traffic drives on the right. Traffic entering the freeway is in red. Traffic exiting the freeway is in green. Through traffic is in gray. All traffic motion of the same color can proceed simultaneously.

A single-point urban interchange (SPUI, /ˈspuːi/ SPOO-ee or /ˈspjuːi/ SPEW-ee), also called a single-point interchange (SPI)^[1] or single-point diamond interchange (SPDI), is a type of highway interchange. The design was created in order to help move large volumes of traffic through limited amounts of space efficiently.

^ "Overview of Reduced Conflict Intersection Design & Operations" (PDF). Wisconsin Department of Transportation. Archived (PDF) from the original on February 1, 2017. Retrieved May 5, 2016.

[1] "Overview of Reduced Conflict Intersection Design & Operations" (PDF). Wisconsin Department of Transportation. Archived (PDF) from the original on February 1, 2017. Retrieved May 5, 2016.

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