• 07/16/24: We are aware of the smishing scams regarding outstanding toll charges. The Mobility Authority will never ask for personal information via text and only send texts with account updates and to those who have opted in to QR Code Digital Billing and Electronic Invoices. Please do not click on links or respond to any suspicious messages. To get the most up to date information about your Mobility Authority account, visit or call us at (833) 762-8655. The Mobility Authority works diligently to protect our customers’ data.

Mobility Authority to Close U-turn at RM 620 in Northwest Austin

U-Turn to Close for Approximately One Year to Accommodate Construction on 183 North Mobility Project

AUSTIN, Texas – Beginning October 10, 2022, Great Hills Constructors (GHC), builders of the 183 North Mobility Project for the Central Texas Regional Mobility Authority (Mobility Authority), will close the U.S. 183 U-turn just south of RM 620, for the U.S. 183 northbound to southbound traffic movement. Drivers traveling northbound and needing to turnaround and travel southbound on U.S. 183 or the frontage road, will be able to turn left at the traffic light at the RM 620 intersection, instead of using the U-turn.

The closure of the U-turn will be continuous, 24 hours a day, seven days a week and will last approximately one year.

The purpose of the closure is to allow construction vehicles and crews access to the center median between the northbound and southbound lanes of U.S. 183 to minimize interference with traffic on the mainlanes, to facilitate the construction of Phase 1 for the project. This access increases safety and reduces the potential for traffic delays from construction vehicle traffic entering and exiting the roadway.

Entrance to the U-turn will be signed as “Construction Traffic Only” with additional signage advising drivers to turn left at the intersection.

*Dates are subject to change based on weather and other circumstances.

More information, including scheduled lane closures, will be updated on the project website:

Graphic showing location of u-turn closure on 183 Frontage Rd & FM 620


About the Mobility Authority

The Central Texas Regional Mobility Authority is a local, independent government agency created in 2002 to improve the regional transportation system in Travis and Williamson counties. The Mobility Authority implements innovative and sustainable transportation options to enhance quality of life and economic vitality in Central Texas. The Mobility Authority operates 183A Toll, 290 Toll, the 71 Toll Lane, the MoPac Express Lane, the 45SW Toll Road, and the 183 Toll Road. The agency is also constructing the 183A Phase III Project in Williamson County, and the 183 North Mobility Project in north Austin.

About Great Hills Constructors

In early 2021, the Mobility Authority selected Great Hills Constructors as the design-build contractor for the project. Great Hills Constructors is a joint venture between Archer Western Construction, LLC, and Sundt Construction – two well-established and highly-regarded construction firms. Archer Western, nationally ranked by Engineering News Record as the second largest bridge builder and the third largest highway contractor in the nation, has been building and constructing numerous projects throughout Texas for over 25 years. Sundt Construction, a nationally recognized leader in alternate-delivery project execution, was established in 1890 and has been building in Texas since 1973. The 183 North Mobility Project guarantees equal opportunity for small, minority and women-owned businesses.

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