Ben Lovejoy said:For what? Where? In what circumstances?
Your earlier messages suggested that it was a universal limit, now we know it doesn't include planes or autobahns. Does it include dual-carriageways? Roads that currently have a 50mph limit? Roads that currently have a 40mph limit? Do you really mean that pedestrians should be able to step out into a road at will in front of trucks, cars and cyclists and that the latter must all be doing a speed that makes this feasible?
The highly elaborate equipment of some black and white paint, a couple of poles and some orange plastic spheres seems to work pretty well.
As a matter of mild curiosity, where is this industrial estate that isn't served by public transport? As far as I'm aware, it is a condition of planning consent for any industrial estate that public transport provision has been made.
Pretty much, is the short answer. Like I said, there's no reason that people can't agree on a rational sacrifice of some public space to faster-moving traffic, but (and I repeat myself) that is not the sitution we have at the moment.
I happen to think that a even a zebra crossing is a fairly elaborate device to need when all you want to do is walk twenty yards. And that's without even starting on pelicans. Not to mention the fact that the existence of such features to a certain degree obligates their use - they make it more difficult to cross elsewhere.
As to your rather picky last point - I made it up. But only yesterday I went to visit a designer on an industrial estate - there is no public transport that will take me there, so whatever conditions exist for the provision, they clearly are inadequate. As an aside, there is nowhere except a large out-of-town Tesco where the people on the industrial estate can get lunch or a coffee...