In my opinion it is the relative speed that hurts you, the speed differential between you and whatever is around you
My son qualified for his drivers licence in Germany where they required eight hours of Autobahn driving with a particular focus on merging and demerging at on and offramps.
The theoretical course included the estimation of braking distances for different vehicle types under different climatic conditions.
Unfortunately these aspects do not feature much in our environment
But I am in full agreement concerning the utterly bullshit, fake, omnipotence of the vaunted Road Captains which make up their herd guidance rules as they go along.
To my mind herd behaviour has always been characterised by taking the lowest IQ and dividing that by the herd population.
So my son and I go on a quick breakfast run to Sabie, mainly for the 200 km of mountain passes in that region. From Sabie down to Hazyview, up to Graskop and then on to Pelgrims and home.
Except that we hit a BMW Herd, lead by the Official BMW Road Captain, riding two by two alongside each other, as if to board the Ark, at a majestic 58.9km/h, just outside Graskop.
The Tailgunner, or whatever title the Rearmost Official aspires to, probably Sphincter Sargeant, rides in a zig zag pattern, blocking, or attempting to block, all passing traffic!
We did not lose much time dispatching this circus!