Fair point. We'd better add proximity sensor data to my proposal. Anyone know the current mandate for rearview mirrors on EU trucks? Are parabolics etc. mandatory. I see a lot of mirrors on some trucks, including "look down" mirrors to see pedestrians, etc. at the very front of the vehicle?

This seems to be the old thing about specific risk assessments and blanket approach. In the ideal world, every stretch of road would have a local speed limit which would reflect the safe speed for that road. Even better we could say that in wet condition the speed limit should be 40 mph but 70 mph in dry with each driver doing their own dynamic risk assessment to decide what is the best speed limit for that stretch of the road. Would it work? Unfortunately there are not enough people in all of the highways departments the UK to make such a system work, so we’re stuck with a blanket approach rather like those building sites that insists that everybody working in their site must have full PPE including hard hat, boots, gloves and safety glasses despoil the fact that most if the time on most parts of the site they don’t need all of these things at once. That’s just the way of the world.

Driving is a skill based, rule governed, expressive activity...so sort out peoples behaviour and the inappropriate speed debate goes away...