Does radar always give the exact speed of the vehicle? Nope. If you are not directly in front the speed will be off, but it is always off in favor of the driver. The greater the angle the greater the difference in favor of the driver. Of course, this is assuming the radar is being operated correctly. Here, if your caught your caught. Get a lawyer and the DA will reduce it 99% of the time but going to court and saying the equipment or officer was wrong will get you no where. We have one of the most stringent training and usage standards in the country. But some states simply stick a radar in car and say go get 'em. I typically won't stop anyone for less than 15 over unless something else is going on or it's in a school zone.