Hmmmm....
Millimetre wave scanner. Sooooooo....
How long before someone hooks it up to take nude piccies of the pedestrians in your way? (As per airport scanners).
So: Drive slowly down beach road.
Aim car at nubile young girl approaching.
Download pictures later.
...Profit??
This apart from having to deal with technology that are too intelligent (for its own or your good) but not intelligent enough (to know when it's being stupid).
What with the disturbing trend nowadays of trying to protect people from their own stupidity, I fear that we are radically making the gene pool much shallower, causing humanity to end up completely unable to think for themselves.
Where's the B-Ark now that we need it?