Traffic will be restricted to a single lane outbound this weekend from the Edgewood-Swissvale interchange to Business Route 22, Monroeville, as part of the continuing rehabilitation of the Parkway East.

In addition to mainline restrictions, a number of ramps will be closed as well from 9 p.m. tomorrow until no later than 5 a.m. Monday.

The Pennsylvania Department of Transportation announced that motorists should expect "significant delays" at times while traveling outbound over the weekend.

PennDOT will also be closing shoulders between 9 a.m. and 3 p.m. in both directions between the Squirrel Hill Tunnel and Monroeville to install conduit and signs.

The following ramps will be closed, starting at 5 p.m. Saturday:

• Penn Avenue outbound ramp. Detour via Beulah Road and Churchill Road.

• On- and off-ramps at Churchill Road. Detours use Greensburg Pike, Penn Avenue and Beulah Road.

• Greensburg Pike outbound exit ramp. Detour via Churchill Road, Beulah Road, Penn Avenue and Graham Boulevard.

• The outbound on-ramps from Route 8 (Wilkinsburg) and Route 30 (Forest Hills) will be closed at 9 p.m. tomorrow.