On Thu, 17 Sep 2015 13:11:49 +0100, Neil Williams wrote:
On 2015-09-17 10:01:22 +0000, Roland Perry said:

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. There's a similar one in Milton
Keynes, the sensors are just metal detectors and feed back (a) which
spaces are free, and (b) direct wardens to overstayers.

The Westfield Stratford version OCRs your numberplate so it can tell
you where you have parked if you have forgotten.