Drivers should be prepared for slower traffic in two of Pittsburgh’s largest tunnels on Sunday morning.

PennDOT plans to institute mobile single-lane restrictions in the Fort Pitt Tunnel and Liberty Tunnel on Sunday morning as it conducts survey work.

Inbound restrictions in the Fort Pitt Tunnel will take place from 7 a.m. to 7:30 a.m., while outbound restrictions will take place from 7:30 to 8 a.m.

Inbound restrictions in the Liberty Tunnel will take place from 8 a.m. to 8:30, while outbound restrictions will take place from 8:30 to 9 a.m.

Traffic may stop for up to 15 minutes, PennDOT spokeswoman Nicole Haney said in a release.

Western Pennsylvanians should also take note of the following upcoming closures:

Allegheny County

• Edgewood: Chestnut Street will close between Elm Street and Aberdeen Street beginning at 6 a.m. on Monday and around the clock through mid-September. Crews are repairing the structure that carries Chestnut Street over I-376 with new fences, barriers and sidewalks. Commuters south of the closure can follow a posted detour via Gordon Street and Edgewood Avenue. Commuters north of the closure can follow Edgewood Avenue and Oakview Avenue.

• Plum: Hulton Road will close in both directions between Eastern Avenue and Morath Lane beginning Monday and through Sept. 7. During the closure, PRT’s P16-Penn Hills Flyer via Harmar will operate as P16L-Penn Hills Flyer via Leechburg. PRT service to and from Harmar, Oakmont, Hulton Road and Hulton Arbors will pause until the road reopens.

• Richland: Route 910 will close between Route 8 and Middle Road from 6 a.m. to 6 p.m. on Saturday, and will then be limited to single-lane alternating traffic until 5 a.m. on Monday. Crews are milling and paving the road. Commuters can follow a posted detour via Route 8, Wildwood Road Extension and Middle Road during the closure. Flaggers will be on site to direct traffic during the lane restriction.

• Collier: A single-lane restriction will take place southbound on I-79 from the Carnegie interchange (Exit 57) and around half a mile beyond it from 9 p.m. to 5 a.m. on Monday night. Workers are patching the road.

• Marshall and Franklin Park: A single-lane restriction will take place northbound on I-79 between the off- and on-ramps at the Route 910/Wexford (Exit 73) interchange beginning Monday and from 7 p.m. to 6 a.m. nightly through Friday. Workers are constructing a new interchange in Wexford worth $46.5 million.

• Robinson: A single-lane restriction will take place on Route 22/30/60 (Steubenville Pike/Lincoln Highway) between Park Manor Drive and Montour Church Road beginning on Monday and from 9 a.m. to 3 p.m. daily through Friday. Crews are working on a structure over I-376.

Butler County

• Buffalo: Ekastown Road will close between its intersections with Parker Road and Meadow Street on Tuesday. Workers are replacing a pipe. Drivers can follow a posted detour via Route 228, Route 356, Route 28 and Route 908.

• Cranberry: Franklin Road will close between Cranberry Commons Drive and Mars Road beginning at 9 a.m. on Tuesday and around the clock through 7 p.m. on Sept. 3. Workers are continuing a $19.1 million safety improvement project in the corridor that includes shoulder widening, rumble strips and sight distance upgrades. Drivers can follow a posted detour via Peters Road, Route 19 and Route 228. Mars Road will remain open during the project.

• Butler and Summit: Rolling closures will take place in 15-minute intervals on Route 422 west from 7 p.m. to 9 p.m. on Monday and on Route 422 east during the same hours on Tuesday. Workers are completing a $6.2 million project to rehabilitate the Shearer Bridge.

Fayette County

• Perry: The Layton Bridge over the Youghiogheny River will close beginning Tuesday at 6 a.m. and through Friday at 6 p.m. The Allegheny Trail will also close daily from 6 a.m. until 6 p.m. Crews are setting beams on the nearby Washington Run Bridge and addressing an unstable rock face. Drivers can follow a posted detour.

• Jefferson: Tippecanoe Road will close between Laureldale Road and Crabapple Road beginning Thursday and through early October. Contractors are performing slide repairs. Drivers can follow a posted detour via Laureldale Road, Perry Road and Route 51.

Westmoreland County

• Delmont, Murrysville, Salem and Washington: Single-lane restrictions will take place between Manor Road and the Route 356 split intersection beginning Monday and daily from 6:30 a.m. until 5:30 p.m. through the end of October. Workers are completing infrastructure projects along the corridor worth $12.9 million.