I dont know what state youre in...BUT you might check to see if there is something called PBJ (probation before judgement)
In essence ,you would be admitting guilt with a suitable reason. In my case,in MD,the fine was halved and MOST important,the "conviction stopped at the judges level. Insurance co's do NOT have access to the records nor do all LEO's.
If PBJ's are available,there are a couple pursuits for you....
1 Why did you think the speed limit was differant? Take a ride back to the route and look for signs posted. Maybe the sign was not posted correctly.Maybe the state did not follow their OWN state requirements. Maybe its reasonable that you missed a sign.
2 I have plead PBJ based on pics alone..not to argue the LAW...but to present why you made the mistake. I would borrow a GPS and take a pic of it with your speedo in the backround.If it displays an error...get it corrected and present all info to the judge.
3 If you find something along the way that shows the state to be lacking...fight the case. I have encountered a few items in my( or my friends) driving career. Yellow lights that switch too fast,signs that were not posted properly,and the MOST common is painted street markings that are worn or faded
In PBJ,s in MD...the officer does not appear in court..you have assumed guilt...with a substantiating reason. If you come to the judges attetion again within two years,he may
penalise you with the full ticket later on...
When I am pulled over and he gives me a warning or a violation....and he says "drive safe" or "be careful" THAT is when I have the hardest time with being stopped. You see....I have 3 DECADES of driving under my belt.(cars,trucks,motorcycles,and all three of them with trailers) I estimate one and a half million miles. I have never injured myself or anyone else while driving.I have never had a single insurance claim as the result of my driving. I HAVE however been rearended FIVE differant times.