US-183A Phase III, Austin, Texas

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The 183A Toll is an 11.6-mile toll road that extends from northwest Austin through Cedar Park and Leander in northwest Williamson County. The facility consists of tolled main lanes with non-tolled frontage roads at the north end. It comprises a 10-foot-wide shared use path that spans 7.2 miles of the corridor and offers multimodal connectivity for bicycle and pedestrian recreation and travel. The project was constructed in phases, with the first phase open to traffic in 2007. Phase II was completed in 2012, more than seven years ahead of schedule. Phase III is underway to extend the toll road from its current terminus at Hero Way northward to State Highway (SH) 29. The first two phases have significantly improved travel times and reduced traffic on adjacent roadways, including U.S. Highway (US) 183. Continued growth along the US 183 corridor in Williamson County is driving the need for additional congestion relief. Between 2016 and 2040, Cedar Park's population is projected to grow by 31 percent, Liberty Hill by approximately 44 percent, and Leander by 271 percent. The corridor is expected to continue to attract residential and commercial development, further intensifying congestion and delays. Traffic volumes along US 183 are expected to increase by 183 percent by 2042, driving the need for proactive congestion relief. Increased congestion along the existing US 183 corridor negatively impacts safety, with crashes more likely to occur at a greater frequency and severity level at cross street intersection locations. In addition, projections show that increased congestion would result in unreliable travel times, negatively impacting the quality of life in the region. The 183A Phase III extension will build on the existing 183A Toll Road, which spans from Ranch-to-Market 620 through Cedar Park and was constructed by the Central Texas Regional Mobility Authority (the Authority) as the agency's inaugural project. Most of the 183A Phase III project will be constructed within the existing right-of-way of 183A and US 183 thus minimizing potential community impacts. The project consists of tolled main lanes with non-tolled frontage roads at the north end, and will extend the existing six-lane, controlled access, grade separated tolled main lanes (two tolled lanes in each direction) 6.6-miles northward from Hero Way to north of SH 29 in Liberty Hill. The project will also include a 10-foot-wide, 7-mile long shared-use path for bicycle and pedestrian use from Hero Way to the planned Seward Junction South, which will provide trail access to the City of Leander's planned South San Gabriel River Park. The 183A Phase III project is expected to provide a reliable, predictable, and time-saving option for drivers and emergency vehicles. It will provide an alternative route without signalized intersections and accommodate community growth and development along and to the north of the corridor.

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