Motorway variable speed limit cameras

[Rotty]

These have just been installed on a section of the M1 I use most days, J25-28

I cannot find any definite answer as to whether they are just used to enforce the reduced speed limits or whether they are also used for the 70mph limit

anyone know ?

 

[Rotty]

let me know when you do

 

[Rotty]

I believe they went active last week.

correct

 

[Rotty]

Can't speak for those but I can tell you 100% that the same type of cameras on the M6, M42 and M25 only work when the signs are lit. When they are lit they can enforce the 70 limit, a national symbol will be displayed.

thast what I thought and am ok with that, its just with no signs lit at all you forget they are there

 

[Rotty]

Does anyone know whether Average Speed Cameras EXCLUSIVELY measure average speed or do they also measure instantaneous speed - i.e. if you pass one at more than 50mph or 40mph as applicable but average less than 50 or 40 between cameras, is this registered?

I have noticed that many people don't slow down until after they have passed the first camera and/or speed up before passing the last one and wondered why

only average, they are not capable of measuring single point speed

 

[Rotty]

How about you just don't speed?

Just an idea...

just asking for research reasons

 

[Rotty]

I've noticed too that the lane discipline has gone to **** since the wider bit opened

other bad bit is that northbound snarls up very friday evening at J28 where it goes down to 3 lanes