A major highway expansion in Central Texas has reached completion, adding toll-road capacity and a shared-use path to support transportation needs in one of the state's growing counties.
Lane Construction, the U.S. subsidiary of Webuild Group, completed the $181 million 183A Phase III extension under a design-bid-build contract, the company announced October 26, 2026. The Central Texas Regional Mobility Authority commissioned the project.
The work extended the 183A Toll Road along a 5.3-mile segment from Hero Way to north of State Highway 29. The expansion added two tolled main lanes in each direction, increasing capacity along the corridor.
The project included construction of 17 bridges, two of which cross the South Fork San Gabriel River. The structures form part of the expanded transportation corridor and support continuity along the toll road.
A shared-use path was also constructed between Hero Way and the Seward Junction Loop, adding a route for users travelling outside the main roadway lanes.
The combination of roadway, bridge and path construction required delivery across several infrastructure elements within the same corridor. The completed extension is intended to improve mobility as communities in Williamson County continue to grow.
The project serves an area that includes Cedar Park, Leander and Liberty Hill. According to project information, traffic volumes along US 183 were projected to increase by 183% between 2017 and 2042, creating pressure for additional transportation capacity.
The expansion is intended to help manage future congestion and reduce commuter travel times. Its completion adds to Lane Construction's portfolio of major highway and interchange projects across the United States.
The 183A Phase III extension demonstrates the scale of work involved in expanding toll-road infrastructure, combining multiple traffic lanes, river crossings and shared-use facilities within a single project.
For transportation agencies and construction contractors, the project highlights the importance of delivering coordinated roadway and bridge improvements in regions facing long-term traffic growth. The added capacity is intended to support travel demand and regional development across Williamson County.
Source: Lane Construction.
