johnsher wrote:
re the M25:
aren't the lower limit signs always on (well they have been every time I've been on the m25 in the past 6 months) as that's what activates the cameras?
Nope, during quieter times the signs are usually blank - if there's been an earlier reduced limit then there'll be one gantry at the end of the limit showing the NSL symbol, after that you won't then see anything on the signs unless there's another sub-NSL limit in force further down the road. Oh yes, and the cameras most certainly CAN be triggered without anything showing on the associated sign... fortunately the one that double-flashed my wife doing an indicated 85 along a nice empty stretch of L4 with nothing on the gantries must have been empty
