In message , at 13:11:49 on Thu, 17
Sep 2015, Neil Williams remarked:

When I was at Heathrow T2 last week I was surprised to see that there
was a CCTV camera for *every* space in the car park. One of the side
effects (although they could do it with less intrusive technology) was
that empty spaces had a green light above them, so you could see from
afar, down each aisle, whether or not there was somewhere to park.

That's "sensor parking". The camera is probably just detecting
presence, rather than being recorded.

Yeah, right.
--
Roland Perry