If there was poor visibility for the driver, there's almost certainly poor visibility for the pedestrian too. Most are sensible enough to walk a little further to where they can get a bit better look at what traffic is coming.

If I did hit someone at a visibility blind spot I'd expect to be shouted at by the cop too for not slowing down to a speed suitable for the visibility, and that the speed limit is a maximum sir. In that special sarcastic voice, common to all British cops. That might be later reflected in my fine or penalty. :)