The Arizona Department of Transportation says the first phase of work on the Loop 202 South Mountain Freeway is set to begin on Monday night.
See a map of the changes below.
Crews are reportedly set to place temporary barriers through the work zone from 48th Street and Pecos Road to the Loop 101/Loop 202 interchange.
Placement of the barriers should be done before Tuesday morning's rush hour commute.
ADOT says after the barriers, crews will start work on the mainline freeway starting in early 2017.
Drivers should expect some lane closures and speed limit reductions in the area.
The entire South Mountain Freeway project is scheduled to be completed in 2019. The project was approved by voters in 1985 and 2004.