Dashcam footage
From watching too much Mythbusters (read: every single show to date) I've seen them on many occasion use high speed footage to measure the speed of an object going past a stripey background with the stripes being a perfect measured width.
So doesn't it stand that even basic dashcam footage (one without GPS) can give you the speed of the vehicle if you measure how many frames it takes to get from one spot to another spot along a road if you know the exact distance between the two spots and the framerate?
Doubtful it would hold up in court as the prosecution would say the camera's framerate isn't calibrated, but it could tell you wether you were even close to doing 40 in a 30 zone.
Biting the hand that feeds IT
