If you suspect that you have a flat tire, the first thing that you need to do is get to a safe location in Franklin, PA so that it can be changed. Avoid braking abruptly as this could result in sliding on the road and possibly losing control of your vehicle. When you're in a safe location, turn on your hazard lights so that other drivers can see you.
Apply the parking brake and wheel wedges to ensure that their car doesn't move. Use a jack to lift your car up off the road just enough so that you can remove the flat tire. Loosen the lug nuts so that you can easily get the tire off the rim. You might have to get a special device from A. Crivelli Chevrolet if the lug nuts are a special design or have a locking mechanism on them.
Once the flat tire is off, you can put the new tire or the spare on until you can get to a mechanic. Lower the jack, remove the wedges, and release the parking brake before getting back on the road.