> What you’re supposed to do is drive at a speed that gives you chance to react to dangers given your visibility and road surface conditions.

Indeed, I always think of my instructor's words "can you stop within the distance you can see". As that distance decreases, you should be slowing down; potentially there's a cyclist or horse right around the corner.

There’s an old guy that walks round the small country lanes at rush hour where I live. He wears a hi vis jacket but that doesn’t do much when you have trees and hedges blocking visibility.

I’m constantly amazed that some idiot hasn’t hit him.