Vehicular access was so much simpler in the 1970s. In a town not a million miles from a guided bus way, impoverished students used the public multi-storey car park to store their appallingly dangerous vehicles. You drove in and took a ticket from a machine. The City Council expected you to pay at the exit. A simple system was devised to hang on to your student grant. You drove out by getting a pal to wheel a supermarket trolley across the entrance ramp, fooling the metal detector, and exited sharpish the wrong way as the barrier was raised.
Usually giggling.