Further to a recent thread. BBC London News had a report on those weird banks of cameras on Borough High Street and Tooley street.
They said that there are 500 volunteeer testers who have a chip affixed to their car. The white box thingies register that a given car is below. So they can track exactly how long a car has been inside the zone.
This paves the way for a charge to be based on the type of car, time of day, miles driven etc. They say the system is nearly 100% succesful.
"They said that there are 500 volunteeer testers who have a chip affixed to their car", said KevinB. I've been watching some of the 'marked' cars (white triangle on roof) going up and down Borough High Street. In my (never humble) opinion they have been driving dangerously ie weaving at speed from side to side when within range of the cameras/sensors ... distressing for those driving in the same line of traffic.
It's part of the same mini-zone congenstion charging experiment discussed at length here. Now the first phase of the project is over they've installed further gantries at lots of the other entrance points to the mini-zone.