- Interchange design and geometrics
- Bridge and retaining wall design
- Traffic signal design and operations
- Drainage design
- Traffic operations analysis
Two URS-designed single-point urban interchanges (SPUIs) opened in Michigan recently—the first SPUIs in the state. The SPUI is an interchange originally developed by URS predecessor firm Greiner Engineering in the mid-1970s in Florida.
With a SPUI, left-turn movements are brought to a single point at the center of the interchange. Opposing left-turn movements are then completed simultaneously under the protection of a traffic signal. A SPUI can be constructed with minimal right-of-way and is ideal for urban areas.
In 2004, the interchange of M-6 at Kalamazoo Avenue was opened, coinciding with the opening of the new 20-mile M-6 freeway around the southern suburbs of Grand Rapids. URS provided the preliminary design and layout of the M-6/Kalamazoo interchange for the Michigan Department of Transportation, as well as complete design of the complex signal timing plans and phasing sequence.
A second SPUI of US 23 at M-59 in Livingston County also has opened to traffic, replacing an outdated tight-diamond interchange. URS prepared the detailed interchange feasibility study and developed the final design plans, specifications and estimates. Two other URS-designed SPUIs are under construction in Michigan. These SPUIs are located at I-94 over US 24 and I-96 under Beck Road in the metro Detroit area.