- Mar 11, 2013
- South Bucks
- S211 E500, SLK55, FJR1300, Caponord
The variable speed limit cameras on the M4 are live as are those on the M25. Ditto any fixed cameras.
The HADECS installations now monitor the VSL on the M25, which is why you have the three small grey cameras on a post about fifty yards before the acrtual installation. If there are cameras in the individual lane boxes in the gantries, they are set to a different trigger speed than the HADECS installations; you can go through under the gantries at 80 with a 40 limit displayed, and there is no flash. I venture to suggest that there are no cameras in those boxes.