Here are the latest updates on four transportation projects now under construction or starting work soon in the Northwest Austin area.

North Lamar Boulevard


On Dec. 12, the city broke ground on improvements to North Lamar Boulevard that will include new traffic signals and bike and pedestrian facilities. North Lamar is one of eight corridors citywide receiving a total of $482 million from the $720 million 2016 Mobility Bond. New smart traffic signals will be added on North Lamar at Powell Lane, Grady Drive and Fairfield Drive as well as a signalized pedestrian crosswalk at Cooper Drive, said Mike Trimble, the director of the corridor program office.

Timeline: December 2019-2024

Cost: $66.8 million

Funding source: 2016 Mobility Bond

Anderson Mill Road


Construction could begin this summer on an expansion project to widen Anderson Mill Road between Spicewood Parkway and US 183. The city will add a center turn lane with turning bays, extend the right-turn lane to US 183, add a raised median near US 183 and create a new lane configuration at Olson Drive. Other improvements will include a continuous shared-use path on both sides of the roadway and a pedestrian crossing signal near 9707 Anderson Mill Road and the Valero gas station. The city anticipates bidding the project for construction in March with work beginning in early summer.

Timeline: summer 2020-21


Cost: $7.26 million

Funding source: 2016 Mobility Bond

Parmer Lane diverging diamond


Construction is underway on the diverging diamond interchange at Parmer Lane and I-35. In early 2020, crews removed concrete medians and began preparing for a traffic pattern switch in February to allow crews to complete reconstruction and maintenance on the Parmer bridge. The new interchange will have drivers cross to the left side of the road for safer turning.

Timeline: July 2019-mid-2021

Cost: $32.5 million


Funding source: TxDOT

US 183 North toll project


The Central Texas Regional Mobility Authority will add four toll lanes between MoPac and SH 45 N. In November, staffers proposed adding a flyover to allow drivers in the southbound US 183 toll lanes to access the MoPac frontage road. The agency’s board will award the final design and construction contract in May.

Timeline: early 2021-25

Cost: $500 million-$580 million

Funding sources: toll revenue bonds, TxDOT