and eastbound entrance that connects to northbound PA 837. The Penn-Lincoln Parkway heads onto the Fort Pitt Bridge, a double-decker bridge carrying four lanes in each direction, and passes over CSX's Pittsburgh Subdivision railroad line and the Monongahela River as it heads into Downtown Pittsburgh at Point State Park and comes to an interchange with the southern terminus of I-279, where US 19 Truck heads north along I-279 and I-376/US 22/US 30 continue east along the Penn-Lincoln Parkway. The I-279 interchange also includes eastbound exits and westbound entrances with Boulevard of the Allies/Liberty Avenue and Fort Duquesne Boulevard that serve Downtown Pittsburgh. The four-lane freeway heads east-southeast between Downtown Pittsburgh to the north and the Monongahela River to the south, reaching a partial interchange with Stanwix Street with no eastbound exit. The highway heads under the Smithfield Street Bridge and comes to an interchange with Grant Street, where it widens to six lanes. I-376/US 22/US 30 pass under the Panhandle Bridge carrying PRT's Pittsburgh Light Rail line and then the Liberty Bridge before the lanes split as it reaches a westbound ramp to Second Avenue north of the South Tenth Street Bridge and south of the Duquesne University campus. Past this, the highway continues east between urban areas to the north and the Monongahela River to the south, with the Three Rivers Heritage Trail in the median. The freeway comes to an interchange connecting to PA 885 and Forbes Avenue north of the Birmingham Bridge, at which point the trail leaves the median of the freeway and the river heads further south from the freeway. I-376/US 22/US 30 head southeast, with the Three Rivers Heritage Trail parallel to the south, and reaches a westbound exit and eastbound entrance with PA 885. The highway turns east away from the trail and passes over the Allegheny Valley Railroad's P&W Subdivision line. The freeway comes to an interchange with Beechwood Boulevard before it narrows to four lanes and passes under the southern portion of Squirrel Hill in the Squirrel Hill Tunnel. Past the tunnel, I-376/US 22/US 30 head through wooded areas and pass over Ninemile Run in Frick Park. The highway leaves Pittsburgh as it comes to an interchange with Braddock Avenue that serves the boroughs of Edgewood and Swissvale. The freeway continues east through suburban areas in Edgewood, passing under Norfolk Southern's Pittsburgh Line and the PRT's Martin Luther King Jr. East