183A Added Capacity Project

Proposal for the addition of a fourth lane in the median of 183A Toll between RM 620 and Hero Way.

Project Information

Due to the unprecedented growth of Cedar Park and Leander, and growing number of drivers on the 183A Toll Road, the Mobility Authority is conducting an environmental study for the addition of a fourth lane in the center median of 183A Toll in both directions between RM 620 and Hero Way.

An additional lane is a proactive measure that will allow for the 183A Toll Road to accommodate future traffic volumes and reduce anticipated traffic congestion for years to come.

Project Benefits

  • Increases capacity of 183A Toll
  • Provides proactive congestion relief through Cedar Park and Leander


Environmental Study Cost: $2,000,000

Funding Source: Mobility Authority


Frequently Asked Questions

Project Information

What is the 183A Added Capacity Project? 

  • The 183A Added Capacity Project is an environmental study for the addition of a fourth lane in each direction in the center median of the existing 183A Toll between RM 620/SH 45 and Hero Way.  

What problem are you trying to address? 

  • Development surrounding the corridor has led to increased use of the 183A Toll corridor. As a proactive measure, the Mobility Authority is seeking environmental clearance to add a fourth lane to 183A Toll between RM 620 and Hero Way. This will allow the agency to add capacity to the roadway as needed to reduce travel delays to users in the future.  

What are the study boundaries? 

  • The study area is a 9-mile segment of 183A Toll from RM 620 to Hero Way.  

How can I stay informed about the project? 

  • We are committed to collaborative and transparent public involvement. Corridor residents, businesses, roadway users, local agencies, the general public, and other interested parties can obtain information about the project on our website, by signing up for electronic newsletters, or calling 512-996-9778. 

Is this project associated with the work on the 183A Frontage Road? 

  • No. The Texas Department of Transportation’s 183A Frontage Road Project will be constructing new non-tolled general-purpose lanes along the 183A corridor between RM 1431 and Avery Ranch Boulevard.  
Environmental Study

What environmental resources are studied? 

  • The 183A Added Capacity environmental study includes, but is not limited to, the review and analysis of:  
    • Natural Resources (State and Federal protected species, water resources) 
    • Cultural Resources 
    • Hazardous Materials 
    • Community Impacts 
    • Traffic Noise Analysis 
    • Air Quality 

How do you plan to address the possibility of additional noise? 

  • The environmental studies performed for the project will include a review of projected traffic noise that could result from the proposed improvements. The Mobility Authority will prepare a traffic noise analysis following the required federal process. The analysis will also evaluate noise abatement measures for the adjacent residents and businesses that might be impacted by traffic noise.  

Will the project affect water quality in nearby waterways? 

  • The Mobility Authority is committed to mitigating impacts of construction to the surrounding environment. Best Management Practices (BMPs) and Voluntary Control Measures (VCMs) will be incorporated into the design and installed prior to construction in efforts to maintain water quality, remaining in compliance with the Texas Commission on Environmental Quality’s Edwards Aquifer Protection Program.  

What measures are in place to protect and preserve natural habitats during and after construction? 

  • The project will remain in compliance with the Endangered Species Act (ESA). Analysis of federally-listed threatened and endangered species and consultation with the U.S. Fish and Wildlife Service will be performed. 

When might construction begin? 

  • If use of the corridor continues to increase as anticipated, signifying the need for an additional lane, construction could begin as early as 2026. 

Stay Connected

Contact us via email below or by phone at (512) 996-9778.

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