On Mon, 12 Aug 2019 at 18:25, Fernando Trebien <fernando.treb...@gmail.com> wrote:
> > There are all sorts of opinions on this matter, but trying to define > classification rules based on physical characteristics or > administrative responsibility (municipality, state or national) always > led to unexpected situations here. I guess the UK is somewhat unique > in having an official classification system that matches the > topological organization of the road system. > I would hope the UK is not unique. The reason it matches (mostly) in the UK is that the classification was assigned based on the characteristics of the roads. It wasn't somebody making decisions based upon a whim, it tried to assign categories based upon usage: it defined a route as being primary if it was the best route. Yes, it is the case that trunks are administered by central government, but again it wasn't (I hope) that roads were arbitrarily designated as trunks but that some roads were so important that central government retained control over them. We did it all that way because people want guidance in choosing the "best" route between A and B. Before we had routeing algorithms, that was the only way to do it. What surprises me is that some other countries didn't do it that way. -- Paul
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