Shooting from the hip here, the speeding (and careless/dangerous) element is managed by the Police in the form of camera vans, patrols, etc. What is done (generally, not specifically by traffic cops) about the clueless drivers with no awareness of what’s going around them; not all of them non-local tourists either?
To me that’s the problem. I don’t think the clown in the right hand lane of an empty M74 going at 60, or a foot behind the car in front on the A82 at 40 is any the wiser, and I don’t see that sort of behaviour being tackled*, despite the accidents it must cause.
*I once saw a Police RR flash up “use correct lane” on their rear display about ten years ago on the M6.