Are you going to traffic court on a speeding ticket?
Do you need to have your speedometer tested for accuracy, to rule out (or in) the possibility of defective equipment? Even 1 or 2 miles in your favor may make a difference. Get it done electronically, using a Global Positioning System (GPS) Receiver. You will get a notarized speedometer accuracy test certificate, showing the true speed and the speedometer reading.
By appointment only. Call (703) 759-6786. Speedometer calibrations may also be done immediately before or after class.