M1 speed cameras - smart motorway section

[N7GTX]

M1 southbound at junction 40 (Wakefield/Dewsbury).

The new smart motorway is up and running and I've seen the speed cameras flash a lot of cars here even with the smart signs not lit. Am I right in thinking they flash because they detect an overspeed but you are not prosecuted unless the smart signs are lit? Quick to say I have not been flashed as yet.

[N7GTX]

Must be near to 70 mph as the cars passing me dont seem to be going that quick? Better safe than sorry then.

[N7GTX]

I don't suppose the Traffic Wombles read this site, do they?

[N7GTX]

snotrag said:

Yup, drove to Donnington on Sunday and saw quite a lot of them go off - and I would reiterate that they seem to go off at not a huge amount over 70 too. Go steady and relax from now on.

Agree with this. And the speedo in my reliable car is miles out too....

[N7GTX]

andburg said:

not viable speed but anyone else caught behind what seemed to be a 50mph rolling police block on the M1 this morning?

Maybe this?

http://www.thestar.co.uk/news/air-ambulance-lands-...