AUSTIN (KXAN) — Crews will be working on MoPac during the day on Thursday and Friday what could be the last round of closures before its new Express Lane opens.

The left northbound lane will be closed north of 45th Street and will be extended throughout the day until 3 p.m. Thursday. That lane is set to be shut down from 35th Street to Ranch to Market Road 2222 (Northland Drive) from 9 a.m. to 3 p.m. Friday

The daytime closures are an effort to make up for lost time after this week’s rainy weather, and workers will be finishing up striping and installing delineator posts. Drivers should expect delays.

Officials said Thursday morning that the new MoPac Express Lane will officially open the morning of Oct. 7, but could be delayed by weather. It runs from Cesar Chavez Street downtown to RM 2222 in northwest Austin. The southbound lanes are slated to open Oct. 27.

The entire MoPac project was set to be finished two years ago. Construction started in October 2013.