OK, so you did something that was prohibited and your only defense is that you didn't see the sign. Unfortunately, that is not a good defense. If you wish to go to court and take your chances, go ahead and do that. Your case will probably be dismissed if the offier does not show.
You really have little to lose. You might also wish to seek the services of a traffic attorney to improve your chances. However, you really do not have any defense. The witness against you is the police officer. If your record is clean, you will get supervision which is not a conviction. It is your decision what to do.
A tough case to win as your affirmative defenses are limited, try to seek a supervision (which is not a conviction). If you instist on fighting this case speak with a traffic attorney in person.
This one is ne of the classic cases of pyrrhic victory in my opinion.
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