Originally Posted by John Forester

I accept your answer about your idea of general traffic principles being "that as far as possible, traffic should be segregated according to vulnerability and speed." Since that is all that you have ever offered, I presume that this is as far as your understanding of traffic principles goes. I see, so that we need to segregate vulnerable passenger cars from invulnerable trucks? And where do buses fit into this scheme? Do their passengers get them classed as vulnerable, or does their size class them as invulnerable? And we need to protect vulnerable fast cyclists from the incompetent slow cyclists who endanger them? And how do you manage to arrange that all these classes manage to travel throughout the city, each vehicle on its own route to its desired destination?

That's it, Hagen's scheme for traffic, based on his understanding of its principles.