In a SPUI, drivers entering or exiting a highway only encounter one traffic signal, which supports all turning movements and travel through the intersecting roadway. This allows freer movement of traffic and more room for larger vehicles like trucks and buses to navigate the intersection. Obvious pavement markings guide traffic through the interchange. The benefit to drivers? Faster, smoother, safer travel in spots where congestion has previously created bottlenecks.
A SPUI is not to be confused with another recent addition to Northern Kentucky roadways, the Double Crossover Diamond (DCD) Interchange, like the one at Graves Road. In a DCD the traffic moves over to the left side of the road so drivers turning left to enter the highway no longer have to turn in front of oncoming traffic. It’s also different from a conventional diamond interchange, where traffic enters and exits the interstate by moving through multiple traffic signals.
