Those speeding tickets are very very easy to beat. The best thing you can do is to dispose of the ticket immediately. If no signed return receipt was requested, there is no actual proof that you ever got the ticket and there is no way you could get prosecuted on that. The state just wants you to pay the fine and not ask questions. This is a huge income stream for some communities and lot of people fall for this trick without knowing their rights. A very important aspect of your defense is is the fact that in court the accuser must be present for someone to be accused. A good lawyer can use this in your favor as the speed camera obviously can not appear in court. The most common used defense technique is the sixth amendment right against self incrimination, which would allow you to not confirm yourself as the driver of the car that was shot speeding.
Last thing to remember is that the majority of the speed camera pictures are not legible because either the license number is not clearly shown, or the make of the vehicle is impossible to be determined. Often driver's face is blurred or obstructed and his identity can not be verified . In fact the speeding ticket from photo radars is so easy to fight that most of the states have already abonded them as a speed monitoring option