take a different route
I don't live in Philadelphia but I have driven to Harrisburg from the Cape many times. I have found the traffic in CT along the coast i.e. 95 to be horrible as one gets nearer to NY. Also there is a lot of construction underway. We always travel via the Tappen Zee bridge and took the somewhat longer route via the Merritt Parkway and eventually rejoin 95 at Milford. Cross the Cape Cod cannel on the Bourne rather than the SAgamore which is under construction again this summer and then parallel the east side of the cannel on and up to Route 6 . Times to avoid are Friday evening and Saturdays between 10 am and 4 or 5 pm. Other times are not usually that bad.