I haven't had to deal with it, but my first thought is pay and move on. There are no insurance implications with the cameras as they do not know who was driving. If you fight it, you probably end up in a situation where you need to provide a driver to the court as part of the fight and that would hit your insurance if you didn't win.
EDIT:
Above assumes that you were guilty but wanted to fight. If you were legitimately not guilty lile if your car was stolen at the time, plead not-guilty and send them a police report number.