The bridge originally included six vehicular lanes and two streetcar tracks on the main deck, with provision for a rapid transit track in each direction outboard of the deck's stiffening trusses, which rise above the deck rather than lie beneath it. The tracks were built to the nonstandard broad gauge of the Public Service Company of New Jersey's Camden streetcar system; the design called for the streetcars to cross the bridge from Camden to Philadelphia, enter an underground terminal beneath the bridge's west entrance plaza, and return to Camden via the opposite track. Streetcar stations were also built in the bridge's anchorages. None of the streetcar facilities were ever placed in service, as Public Service ran no cars across the bridge from its opening until the company abandoned its Camden streetcar system in 1932; after that, the tracks were removed and the space converted to vehicular lanes.
The outer pair of rapid transit tracks went into service in 1936 with the opening of the Bridge Line subway connecting Broadway and City Hall in Camden with 8th and Market streets in Philadelphia; the Bridge Line, extended to 16th and Locust in 1952, began carrying PATCO trains in 1969. Today, it carries PATCO's Lindenwold High-Speed Line (PATCO Speedline) via connecting tunnels on both sides of the bridge.
The westbound approach to the bridge shows the zipper barrier and the overhead gantry lights
The seven vehicular lanes are divided by a concrete "zipper" barrier, which can be mechanically moved to configure the lanes for traffic volume or construction. Red and green signals mounted on overhead gantries indicate which lanes are open or closed to traffic in each direction. The lights indicate closures for construction, accidents or breakdown as well as traffic separation. Generally, during the morning rush hour, there are four lanes open westbound and three eastbound, with the situation reversed during the evening rush hour. Before the zipper barrier was installed, one lane of the bridge was kept closed at peak times to reduce the risk of head-on collisions as there was no physical barrier separating east and westbound traffic.
Pedestrian walkways run along both sides of the bridge, elevated over and separated from the vehicular lanes; of these, only one is open at a time. The DRPA temporarily closed the walkways to the public the day after the 7 July 2005 London bombings, citing security concerns. The DRPA also closes the walkway after snowfall, or if the weather forecast includes a chance of snowfall, and closed it in late August 2011 during Hurricane Irene and in late October 2012 during Hurricane Sandy.
A 2006 production of the musical Godspell at the Walnut Street Theatre in Philadelphia, directed by Ryan Oczkowski, was set under the Franklin Bridge, with Jesus' followers portrayed as living in a shack there.