adam . # . 1/1

Red Ken's congestion plan involves hundreds of security cameras tracking the license plate of every vehicle crossing in and out of London. There's no clear gateway either, but hundreds of smallish roads at the congestion charge border. Seems to me a GPS is almost equivalent and possibly even cheaper.

I think a sticker would have been a better solution. Track the cars that don't have them.

The Oyster card, the London Transport smartcard, also tracks every journey made by its user.