Journey delays are monitored across the following network.
This information comes from Automatic Number Plate Recognition Cameras at motorway junctions. So they can only detect that a delay has occured, not where or why.
When a line shows a delay, it means that there is a delay somewhere along it. It does not mean that the whole route is delayed. They cannot show where along the route the delay is occuring.
The lines on the maps are for illustration only, thet do not exactly follow the roads.
Traffic Delay data are supplied by the UTMC Common Database. Last Updated: 04 May 2011 09:06:4004/05/2011 09:06:40. Oldest Record: 04 May 2011 09:06:4004/05/2011 09:06:40.