Tony Luke's is a good suggestion for a cheesesteak or a roast pork sandwich.
Another place I would recommend is John's Roast Pork. They are located on Snyder Ave, only a short drive from the Columbus Boulevard Exit of I-95. They were voted #1 in cheesesteaks this year by 610 WIP Sports Radio. The only word of caution with John's is to check their hours before you go. They open early and close early and are not typically open after 3 or 4pm.
If you get off at Oregon Ave, you can go to Tony Luke's. They are literally right around the corner from the I-95 exit and you can get right back on very easily when you are finished. Very good cheesesteaks and roast pork sandwiches. If you are driving with a friend, get one of each and share.
Here is their website which has a link for directions.