The East Coast Greenway is a developing trail system, spanning nearly 3,000 miles as it winds its way between Canada and Key West, linking all the major cities of the eastern seaboard. Nearly 25 percent of the route is already on safe, traffic-free paths. In PA the greenway enters Morrisville from Trenton, New Jersey over the Calhoun Street Bridge. At this time, it follows PA Bike Route E for much of the 55-mile route, passing through lower Bucks County, Philadelphia and Delaware County, and then crossing into the State of Delaware near Marcus Hook. Until more trail is built, the route through PA is primarily on road. Non-cyclists will enjoy the segments through Philadelphia thanks to ample sidewalks, but there are sidewalks throughout much of the rest of the route, as well. Bicyclists will experience pleasant riding that is well marked with Bike Route E signage. Travelers pass through a series of small towns and neighborhoods on the northern end of the route before the Greenway goes directly through downtown Philadelphia, best known for its rich history, monuments of liberty, and, of course, the Philly Cheesesteak! The route then picks up on the Schuylkill River Trail for about 2 miles before continuing on Bike Route E south to Delaware, running straight through a refinery area that makes a unique, yet unexpectedly pleasant, travel experience.