If the signs do not met DOT standards you have to bring the FMVSS (federal motor vehicle safety standard) to court with you) Pictures too. The deal should be written. Be careful judges can be VERY ignorant when it comes to traffic law. (safety nazi's rule there)
Generally once a private community is developed, the development signs a "domestication" agreement with the local police department. this gives them authority over the roads and makes the roads public. No agreement then the roads are private land and police may not write citations. Use
http://www.findlaw.com to search you state's specific rules. Check with the police department for the agreement.
Make preliminary motions to dismiss BEFORE your actual trial. If the Judge offers a "Withhold" or some non-adjudication result you should consider taking it. It should prevent the citation being used in a civil matter. Remeber NEVER SAY GUILTY. No contest, perhaps if the deal is right.
If you want a record consider hireing a court reporter. Generally 50-75 per hour. Not all traffic tickets hearings are recorded. Not all traffic cases involve prosecutors. Its about revenue NOT justice.