Sounds like my stupid (brilliant?) idea, an autonomous car lift. Travel under/around speeding or otherwise criminal drivers, travel at the same speed and pick the vehicle up (from the frame, not the wheels).
Reckless driver kills child pedestrian. Gets caught, grabbed in air by large police vehicle. Driver has disabled vehicle recorder. Backup vehicle recorder hidden in lug nut is played back.
"At 11 am, James 'Poxie' Smith was vaporized."