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I-35 Capital Express South


The I-35 Capital Express South project proposes to add two non-tolled managed lanes in each direction along I-35 from SH 71/Ben White Boulevard to SH 45 Southeast. Managed lanes are proposed in high-congestion areas where right of way is limited. These lanes are designed to provide a less congested route than adjacent general-purpose lanes during peak periods for qualifying vehicles. Managed lanes control access by placing restrictions on use. The project also includes additional safety and mobility improvements. Visit our new I-35 Capital Express Program website for the most up-to-date information on this project.

Need & Purpose

  • Improve safety and mobility

Project Description

  • Add two non-tolled managed lanes in each direction
  • Improve bicycle and pedestrian accommodations along I-35 frontage roads and at east/west crossings


  • Project development and construction funded by TxDOT and CAMPO
  • Construction cost: $548 million


  • Finalized schematic and environmental study: December 2021
  • Plans, Specifications and Estimates (PS&E): January 2022
  • Construction letting: May 2022
  • Construction start: November 2022


Project Vicinity Map



Public Information Officer
(512) 832-7000

TxDOT Austin District
P.O. Box 15426
Austin, TX 78761-5426

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