I'd pay it and be done with it. It's a civil violation in Georgia and won't go on your driving record. If you go to court, you've lost a day's leave from work which I'm sure will cost you more than $80. If you don't pay it, they will send it to a collection agency and harm your credit. Just pay it and sell me a gun for $80 to get your money back! ;-)
Yeah it would cost me a lot more than $80 to fight it but I'm okay with that if I had a chance of winning. I'd rather take a day off work and even pay a lawyer a few hundred bucks to keep the state from profiting off of me.