Any weather issues? Sun in your eyes, fog, rain, sleet, snow, water on road?
If the officer doesn't show, then you don't have any accusers. Move for dismissal.
No video, it's your word against his. Good luck with that one...Did he have a good vantage point?
Profiling involved perhaps?
Honestly, if the judge gets a bad attitude toward anything you are trying to say, you probably are best off paying the fine...I respect the justice system, but judges are (very) human, and all it takes is them waking up on the wrong side of the bed.