Smarter than having to drive alongside the offender and visually confirm the stupid he/she might be doing, and since you just have to set up "camp" alongside a road and ppl will pass by en mass and you just have to pick out the naughty ones.
I would like to have a simmilar camera, able to track my head so where ever i turn my head and look so do the camera on top of the roof ( should be easy to implement.
I guess its allready there in many countries with roadside cctv cameras, just have to formulate a program that can edit out the ones in the cars braking the law.
EDIT: now you mention it dash riposki, the bottle in brown paperbag in the US allways freaked me out.