Fall Line. From Petersburg onward, it is parallel with I-95. After exiting DC into Maryland, US 1 follows the Baltimore–Washington Boulevard, the first of several modern highways built along the Washington–Baltimore combined statistical area corridor; I-95 is the newest, after the Baltimore–Washington Parkway. US 1 runs through the University of Maryland, College Park, campus in College Park, Maryland. The route bypasses Downtown Baltimore on North Avenue and exits the city to the northeast on Belair Road, gradually leaving the I-95 corridor, which passes through Wilmington, Delaware, for a straighter path toward Philadelphia. Around and beyond Bel Air, US 1 is a two-lane road, crossing the Susquehanna River over the top of the Conowingo Dam before entering Pennsylvania. (Routed further north, US 1 bypasses the state of Delaware, unlike I-95.) The two-lane US 1 becomes a four-lane expressway, officially known as the John H. Ware III Memorial Highway, after the Pennsylvania representative, just after crossing into Pennsylvania. This bypass extends around Oxford and Kennett Square, merging into the four-lane divided Baltimore Pike just beyond the latter. At Media, US 1 again becomes a freeway—the Media Bypass—ending just beyond I-476. After several name changes, the road becomes City Avenue, the western city limits of Philadelphia, at the end of which a short overlap with the Schuylkill Expressway (I-76) leads to the Roosevelt Expressway and then the 12-lane Roosevelt Boulevard partly overlapping US 13. US 1 again becomes a freeway after leaving the city, bypassing Penndel and Morrisville and crossing the Delaware River into New Jersey on the Trenton–Morrisville Toll Bridge. After crossing into New Jersey in Mercer County, US 1 continues on the Trenton Freeway through the state capital of Trenton and Lawrence Township as a four-lane freeway. As the freeway ends, the four-lane divided highway upgrades to six lanes north of I-295 passing through the Penns Neck section of West Windsor. Through Penns Neck is a series of traffic signals. The New Jersey Department of Transportation (NJDOT) is looking to revamp the highway through this area by replacing traffic signals with grade separations. The highway enters Middlesex County through Plainsboro Township and South Brunswick, where the highest point resides. By Forrestal Village, the highway downgrades from six to four lanes until after Finnegans Lane in North Brunswick. Northward, it continues through New Brunswick as a short limited-access highway until the County Route 529 (CR 529)/Plainfield Avenue traffic signal in Edison. Through