U.S. Federal Route 30 runs along a expressway through Allegheny County, except for a short segment between the junction with Interstate 376, near Edgewood, and the Allegheny/Westmoreland County Line. U.S. Rt. 30 passes through the following towns in Allegheny County. Clinton Imperial Pittsburgh Forest Hills Chalfant East Pittsburgh East Mc Keesport U.S. Rt. 30 is multi-plexed in Allegheny County. U.S. Rt. 22, from near Imperial to near Edgewood. Interstate 376, from near Carnegie to near Edgewood.