Philadelphia is connected to New Jersey across the Delaware River by four bridges, three of which are maintained by the Delaware River Port Authority. The oldest is the Benjamin Franklin Bridge, which opened in 1926, and was the world's longest suspension bridge span until the opening of the Ambassador Bridge in 1929. The Ben Franklin Bridge connects Camden, New Jersey with Center City, thus making it a main crossing between Philadelphia and New Jersey. The Benjamin Franklin Bridge carries seven lanes of roadway, two rail lines of the PATCO Speedline, and two pedestrian walkways.