by John Beagle
The SPUI is now operating properly like the one at Sawmill Road in Columbus, Ohio (see photo below). This is despite the fact that all lanes are not operational as of today as evidenced by the photo above.
A SPUI is a single-point urban interchange. A single point urban interchange is similar in form to a diamond interchange, but has the advantage of allowing opposing left turns to proceed simultaneously by compressing the two intersections of a diamond into one single intersection over or under the free-flowing road.
The major disadvantage of single point urban interchanges over other types of road junctions is the increased cost due to the need for a longer or wider bridge. A freeway-under SPUI requires a wider bridge over the free-flowing road to make room for the compressed on- and off-ramps. Since the RT-63 Bridge was in a state of failure, a new wider bridge was built to meet the SPUI specifications.
The new interchange is being discussed right now on the Voice: New Interchange
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