The Central Texas Regional Mobility Authority is constructing two tolled lanes in each direction, an overpass at the Hwy. 29 intersection, ve bridges and a shared-use path as part of the third phase of the 183A Toll project.
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Shared-use path
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Southbound nontolled general purpose lanes
Northbound nontolled general purpose lanes
Southbound toll road
Northbound toll road
Due to increasing trac volumes and substantial growth, the Central Texas Regional Mobility Authority is extending the 183A Toll from Hero Way in Leander to Hwy. 29 in Liberty Hill. The project is under construction and will wrap up in early 2025.
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SOURCE: CENTRAL TEXAS REGIONAL MOBILITY AUTHORITYCOMMUNITY IMPACT
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183A Phase 3 toll extension
Bridges Shared-use path Nontolled frontage road lanes
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“The rst plans for [183A] were put on the map in 1985. … It took 22 years to get to that rst phase,” Long said. “The second phase was completed six or seven years ahead of schedule because of the demand.” Since the 183A project began, sub- stantial commercial and residential growth has occurred along that corri- dor, said Mike Sexton, acting director of engineering at the Mobility Authority. On US 183 near the San Gabriel River in Leander, trac volumes were 18,400 a day in 2011, according to Texas Department of Transportation data. This number increased to 40,209 cars a day in 2021, a 118.5% jump. A Mobility Authority environmental study determined the average annual daily trac projections for the third phase of the 183A toll system. On 183A from Hero Way to Bryson Ridge Trail, trac is predicted to increase from 22,200 vehicles per day in 2016 to 64,800 in 2042. From Bryson Ridge Trail to Hwy. 29, it’s projected to increase from 33,800 to 92,300 during the same timeframe. “Any improvements that can and will be done to … [US] 183 will help hopefully alleviate some of that traf- c,” Liberty Hill City Administrator Paul Brandenburg said.
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nontolled lanes in each direction, Cen- tral Texas Regional Mobility Author- ity ocials said. The work currently taking place in the project boundaries includes tunneling underground to build the extended 183A underneath Hwy. 29; beginning construction on the new Hwy. 29 overpasses over 183A; erecting retaining walls; and installing drainage systems and utilities. This extension is the third phase of the 183A Toll project. The Mobility Authority is expanding the toll road north as the population in Liberty Hill is expected to grow to 112,420 by 2042 and Leander to 163,414 by 2040, according to the cities’ data. “It’s unbelievable growth, and [US] 183 is our main thoroughfare, so every- one is going to be dumping onto that,” said Kat Howell, a long-term Leander resident and town historian. “Expand- ing that direction is an absolute must.” Mapping it out In March 2007, Phase 1 of the 183A Toll project system from RM 620 to RM 1431 was completed. The 5-mile Phase 2 extension from Cedar Park to Hero Way in Leander opened in April 2012.
Main lane toll points Entry/exit ramp toll point Pedestrian crossing
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183A TOLL
Work to construct a bridge over San Gabriel Parkway is underway.
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SOURCE: CENTRAL TEXAS REGIONAL MOBILITY AUTHORITY COMMUNITY IMPACT
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