Once a parking ticket has been issued, there are 2 options available, you can pay it or appeal it.
The issue of an appeal is whether or not the cited rule was violated. Therefore, an appeal is warranted if you believe that the ticket was issued in error or that you did not commit the violation described in the ticket. You may also appeal the ticket if you believe it was issued correctly and you committed the violation described, but you believe that there were mitigating circumstances involved. Please keep in mind, however, that it is no defense to “not mean” to violate a rule, to “see others” violate it, to “not realize” it was violated, or to have “violated it in the past without penalty.”
To appeal a ticket, you will need to complete the City's parking appeal form (PDF).