Correction: This story has been updated based on new timeline information provided by the Corridor Program Office.

While major construction on Slaughter Lane and William Cannon Drive is not scheduled to begin until 2021, the Austin Corridor Program Office is surveying the two roadways this summer in anticipation of long-awaited improvements funded through the city’s 2016 mobility bond.

According to the corridor program office, the projects are still in the design phase, and survey work over the summer will provide topographical data and confirm the location of utilities while also confirming property lines and rights of way.

Slaughter Lane

For Slaughter Lane, $74 million in work is scheduled through 2024.

A project to widen the roadway to six lanes from MoPac to Brodie Lane could break ground next summer, according to the corridor program office.

Throughout the overall corridor, which runs from Vertex Boulevard to RM 1826, the corridor program office will replace traffic signals, install pedestrian beacons at select crosswalks and will make additional pedestrian enhancements, such as protected bike lanes. The majority of work is scheduled from 2021-24.

The Escarpment Boulevard, Brodie Lane, and South Congress Avenue intersections with Slaughter will also be addressed to improve turn lanes and traffic flow. The work at Escarpment could start in the spring, according to the office.

William Cannon Drive

Similar to the Slaughter improvements, William Cannon Drive will see new traffic signals and pedestrian accommodations installed from McKinney Falls Parkway to Southwest Parkway, totaling an estimated $46.6 million, according to the corridor program office.

The first section of the corridor to be addressed will be near Running Water Drive in Southeast Austin, where a new bridge will be built over Marble Creek and the road will be widened to four lanes. Work on the section could begin in summer 2021.

Intersection improvements will be made from late 2021-24, including the Pleasant Valley Road, Bluff Springs Road and Brodie Lane intersections with William Cannon.