From road projects to trail updates, here is the latest information on several transportation projects happening in the Northwest Austin area.

Resurfacing Parmer Lane

The Texas Department of Transportation pushed back the timeline to resurface Parmer Lane from MoPac to the I-35 southbound frontage road. The project is expected to begin Sept. 17 and wrap up Nov. 1. Timeline: mid-September-November Cost: $1.5 million Funding source: TxDOT

North Lamar Boulevard sidewalks

The city of Austin is adding new sidewalks to fill in gaps along North Lamar Boulevard from US 183 to Braker Lane. The project includes replacing existing sidewalks. Timeline: June 2017-late 2018 Cost: $1.5 million Funding sources: city of Austin, TxDOT grant

Updated Lamar Boulevard bridge railings

TxDOT will finish upgrading and replacing railing near bridges along the roadway from Walnut Creek Metropolitan Park to Payton Gin Road by the end of September, weather permitting. Timeline: Aug. 1-September Cost: $175,000 Funding source: TxDOT

MoPac toll lanes

The Central Texas Regional Mobility Authority is anticipating the rest of the northbound express lane to open in late September with the full project opening in early November. In mid-September crews completed final paving on the northbound side and began final paving on the southbound side. The agency estimates the toll for the entire length of the lane on one side could be in the $2 range. Timeline: 2013-early November 2017 Cost: $204 million Funding sources: various

Northern Walnut Creek Trail Phase 1A

Construction will begin this fall on the last segment of Phase 1 that will complete the trail in Balcones District Park. A portion of the project is already under construction as part of the Waters Park Relief Main project that aims to increase wastewater capacity near the park. The work to build the trail from under MoPac to the south side of the baseball field at the park will be done this fall. Timeline: fall 2017-2018 Cost:  $847,000 Funding source: city of Austin bonds

Northern Walnut Creek Trail Phase 2

The city is still working on the design to extend trail from Walnut Creek Metropolitan Park to I-35. The 10-foot-wide trail will be 1.8 miles long and have two trailheads at North Lamar Boulevard and Oakbrook Drive. Design work will be completed next spring. Timeline: fall 2018-fall 2019 Cost: $3.5 million-$4 million Funding sources: city of Austin Parks and Recreation Department, 2016 mobility bond program, TxDOT