teuchter
je suis teuchter
and a slow moving vehicle among faster ones is a hazard
What you mean is that a mixture of vehicles attempting to move at different speeds can be a hazard (and indeed can exacerbate congestion). It does not follow that making the slower vehicles move faster is the best or safest way to resolve this situation.
Motorways are a completely different situation to urban roads. They are irrelevant to this discussion.