Bitcoins could solve this problem so easily, cause I know sometimes I am just too far to put money in a meter, and with bitcoins you get an address as soon as you pull up, then you can just keep depositing into that address to keep the meter filled. I wonder if anyone has explored that?
It depends on the purpose of the meter. If the meter is there to collect money for the city, then that should work fine. If the meter is there to encourage people to move their car within a time limit, then that defeats the purpose.