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Beginning in 2011, a partnership between TxDOT, the city of Austin and the Capital Area Metropolitan Planning Organization formed with the goal of improving I-35 within the limits of SH 130 (north of Georgetown) and Posey Road (south of San Marcos). This locally-led initiative, called Mobility35, is working to improve mobility on I-35 in the Capital area.

Why I-35?

The I-35 corridor through downtown Austi​​​n is identified as one of the most congested segments of roadway in Texas​. The Texas A&M Transportation Institute determined that if nothing is done to address Austin’s congestion issue, the 19-mile commute from downtown Austin t​​​o Round Rock will take as long as 2.5 hours by 2035.

Learn more about the history of the Mobility35 program and use the map below to explore potential improvements along I-35 in Williamson CountyTravis County, and Hays County.​​


I-35 Hays County Feasibility Study Virtual Open House
Posted: 3 March, 2015

​Mobility35 Virtual Open Houses are a great way to stay connected with the project, even when you can't make it to the Open House. Check out the I-35 Hays County Feasibility Study Virtual Open House, available now - March 18.

Interested in Mobility35 Plans for Hays County?
Posted: 23 February, 2015

Mark your calendar to attend one of our Open Houses, planned for March 3 and 4, 2015. Learn more.

Mobility35 Corridor Implementation Plan Update Released
Posted: 31 December, 2014

The December 2014 update to the I-35 Capital Area Improvement Program (Mobility35) Corridor Implementation Plan is available now​. ​

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