In Rick's book he says ".. I just pull into the most central 'disk' or 'pay and display' parking lot I can find. Disks can be bought at nearby shops."
In looking at the aa site and other sites about parking, the first thing they say is wrong is to park without a disk. Do they allow time to go to a nearby shop to purchase these? Should one person remain in the car? Am I getting too paranoid about this?