Fighting parking ticket is a process entirely dependent upon your ability to build a case that proves your innocence. The ticket you receive is taken to be correct, and your word alone will not overturn it. What you need to do is collect evidence that you feel either will prove your innocence or help build your case. You should begin doing this as soon as you get the ticket. To possibly save you from a long process, check the ticket first for errors, as serious errors can lead to an immediate dismissal. That said, document your 'crime scene' by writing down and/or photographing things that support your claim. This could be missing, tampered with or obstructed signage. It could also be a broken meter. If you feel the timing of a meter is off, then you need to request the service records to see if the machine has been calibrated recently. Whatever you use to prove it, you need to be aware that to successfully fight a parking ticket, you must present proof of your innocence or discover a technicality that is grounds for a dismissal.