The Central Texas Regional Mobility Authority is moving ahead with expanding its Toll 183A from Hero Way in Leander to north of Hwy. 29 in Liberty Hill.

Mobility Authority Executive Director Mike Heiligenstein updated the Williamson County Commissioners Court on the status of current and future projects as well as the agency’s annual financial report during an April 23 meeting.

“This is a really important document for our investment community, and therefore it’s a really important document to our two counties so we can continue doing projects,” Heiligenstein said.

The Mobility Authority, the largest regional mobility authority in the state, looks to address current and future mobility needs through partnerships and create a comprehensive regional transportation network, according to its website. The agency works with elected officials and other transportation agencies in Travis and Williamson counties.

The Toll 183A Phase 3 project will address increasing populations in Cedar Park, Leander and Liberty Hill by adding three tolled lanes in each direction from Hero Way to CR 213/258—a 6.6-mile stretch. Heiligenstein said construction of the Phase 3 project is expected to begin late 2020 and be completed in late 2023.

The Mobility Authority previously completed Toll 183A, which extends 11 miles from north of RM 620 in Northwest Austin to Hero Way.

Funding for the project will be paid through a combination of revenue bonds and a federal Transportation Infrastructure Finance and Innovation Action loan, according to the website. Revenue from tolls will be used to pay principal and interest payments on the bonds and TIFIA loan and pay for the long-term maintenance of the facility, it said.

The Mobility Authority is also responsible for expanding US 183 south between US 290 and Hwy. 71 for better ease to the airport, building three free-flowing flyover bridges between the Hwy. 290 toll and SH 130, and adding express lanes on MoPac between Cesar Chavez Street and Slaughter Lane, among other projects.

“There is a reason for ‘regional’ being in our name,” Heiligenstein said.