I would fight it on principle as these kinds of money making actions by departments will only grow as they're shown to be successful revenue streams. My hometown had two installed and they were removed within 9 months for the number of challenges that were brought and how quickly judges were to dismiss tickets.
You may be able to send someone in your stead to if you know someone there or can find a reasonably priced legal rep which potentially could be less than your flight. Since you have video evidence it should be pretty open & shut.