On Tue, 13 Aug 2019 at 04:23, Joseph Eisenberg <joseph.eisenb...@gmail.com> wrote:
> > Rather than using highway=trunk to define a autovia, motorroad or > expressway with a certain maxspeed=, lanes=, or surface quality, I > believe it is better to either 1) follow the national classification > system, when this is logical and internally consistent, Hard agree. Even though it's starting to look like I live in the only country in the world with a national classification system that is logical and internally consistent (and even we have a few rare exceptional cases). :) > or 2) use network relationships and to assign a classification for a complete road route between towns. Changing the classification from trunk > to primary to trunk again, in the middle of a rural area, breaks the > network. > I don't really agree on this. It is possible for two trunks to be linked by a primary. In some cases it's mostly trunk from A to B with a bit of primary in the middle. In some cases two trunk routes, one from A to B and the other from C to D have a primary linking them, and you'd use that primary to get from A to D. And then there are cases where a section of a trunk road has been upgraded to, or replaced by, a motorway. UK map readers cope with these being rendered somewhat differently. They're even able to take secondary routes into account. These things are coloured whereas minor through routes and non-through routes are not. You look for the coloured roads linking A to B and try to figure out which is going to be best. Where it goes wrong is people deciding that a trunk, primary, or even secondary passing through a town, city or village should be tagged as residential. Certainly mappers should also tag maxspeed=, lanes=, surface=, and > should map divided highways as 2 separate ways, and grade-separated > intersections with bridge= and tunnel= + layer= so that routers will > recognize faster routes. > Yep. But I don't see those as a way of allowing one to tag primaries as trunks. They're a way of allowing routers to recognize that one particular primary has characteristics that are as good (or even better) than one particular trunk where either would be feasible alternative routes. -- Paul
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