The Single Point Urban Interchange (SPUI) currently under construction at U.S. 75 and Parker Road is the first of it's kind in Texas. The SPUI requires less rights of way than traditional designs. It will help improve traffic flow and safety by easing congestion. The project which has been endorsed by the Texas Department of Transportation, is scheduled for completion in late 2010.

How do Single Point Urban Interchanges (SPUI) compare to traditional interchange designs?

The traffic safety record of a SPUI design is comparable to that of a traditional freeway interchange design. A SPUI design can move more traffic than a traditional design, and do so with less traffic delay and congestion. SPUI designs also require significantly less right-of-way for construction as compared to traditional interchange designs. This SPUI, upon completion, will be the first of its kind in Texas. Because of their ability to effectively move traffic SPUI designs are increasingly popular. The SPUI has been deployed sucessfully around the United States in Virginia, Louisiana, and Arizona, as well as in other countries.

How does a SPUI designed interchange decrease traffic delay and congestion?

A SPUI design provides long gradual turns for use by large vehicles like trucks, busses, and recreational vehicles. The design requires the use of only one set of traffic signals, and these signals allow opposing left-turn movements to occur at the same time. The concurrent movement of opposing left-turn traffic is where the SPUI design excels over traditional designs. Because these turns do not cross each others path they can be served without having to take several signal cycles to do it. A traditional interchange design requires opposing left-turn traffic to cross paths thus each movement must be served by its own separate signal phase. When left-turn traffic volumes are high it may take several signal cycles for traffic to clear the interchange when using a traditional design.

Are SPUI designs pedestrian and bicycle friendly?

Yes! Bicycle and pedestrian paths are clearly marked by using traffic safety signs, raised curbs, road medians, and reflectorized pavement markings. These devices are easily seen during periods of inclement weather and heavy traffic congestion.

How well does the SPUI design fit into the US–75 Corridor?

The SPUI project fits very well into the existing right-of-way along this corridor. The project enhances traffic flow and safety, access to businesses, and is endorsed by the Texas Department of Transportation.   

For information about the construction of this project, please call Ceason Clement of TXDOT at (469) 446-8193.