Imagine all these self driving cars networked together... scanning a 200ft radius millions of times a second creating a effectively recorded 3d world. If there's enough cars, they could have a 3d record of most places - though admittedly storage would be an issue. Good luck trying to do ANYTHING wrong.
"Sorry, car 23034 identified you as speeding, here's your fine..."
On a lighter note, pretty good news for racing sim fans, getting details 3d scans of awesome roads won't be as difficult.
"Here comes Mr. Bill's dog." -- Narrator, Saturday Night Live