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Work on the Phase III extension of the 183A tollway includes adding two tolled main lanes 6.6 miles in each direction from Hero Way to North of SH 29, and constructing a shared use path from Hero Way to the proposed Seward Junction Loop project.

recycled content low carbon rebar used
gallons of drinking water saved by using reclaimed water for dust control


The extension of 183A will include the construction of 17 bridges, two of which are over the South Fork San Gabriel River.

The project is scheduled to be completed in October 2024.


  • With unprecedented growth in Williamson County, especially in Cedar Park, Leander, and Liberty Hill, traffic volumes along the 183 are seen increasing by 183% over the next 25 years. The project will help alleviate future congestion and reduce driving times for commuters.

Technical Highlights

  • 2 additional 6.6-mile-long tolled lanes
  • Construction of a shared use path
  • 17 bridges