Can you drive a 50cc scooter without tag or license on the road in pa?

no. Pennsylvania and New Jersey have the strictest laws regarding mopeds and motor scooters which really stinks. Motor scooters are classified as "motorized cycles" by the PENNDOT which is Pennsylvania's department of motored vehicles. here is a link from their page that should answer any legal questions you may have for motor scooter laws in Pennsylvania. also, there is a link at the bottom of this page that says, "mopeds, motor-drivencycles, and motorcycles" at the bottom highlighted in blue. I recommend following that link for a more detailed description of the laws.