I think it is alright as long as you block out anything that might identify someone (license plate, name, address, etc...). Paparazzi take all kinds of photos people don't want taken and can still publish them (not comparing you to paparazzi), but the principle is the same.
HOWEVER, I am no expert on this subject and I would wait to hear what someone with more knowledge on it says. In the end though, I think it is all right, don't trust me though.

EDIT: I didn't see your response Hyperion, we responded at the same time so you might know more about it than me, but it's my $0.02 though.
