I've had one through for 52mph on the M6 near Coventry on a smart motorway showing 40mph. The thing is, I'm sure that the matrix signs were showing 50. However, I wasn't quick enough to think to press the horn and keep the video. My advice would be that if you get flashed on a smart motorway, press the horn and review the footage when it is safe to do so. Without the video, I'm not brave enough to challenge, so I opted for the motorway speed awareness course via Zoom in Jan.
Since then, I have noticed that the speed display in the car seems to be spot on. When I pass other cars, where you can see their speed displayed, mine is always lower even though I'm passing. Made me think that the old days of the displayed speed being higher than actual are gone.
My cause wasn't helped when I then got another on the M1 near Sheffield for doing 65 in a smart motorway 60mph limit. I'll be taking the three points for that one. Stupid boy!
Since then, I have noticed that the speed display in the car seems to be spot on. When I pass other cars, where you can see their speed displayed, mine is always lower even though I'm passing. Made me think that the old days of the displayed speed being higher than actual are gone.
My cause wasn't helped when I then got another on the M1 near Sheffield for doing 65 in a smart motorway 60mph limit. I'll be taking the three points for that one. Stupid boy!