Honestly couldn't hurt the cycleways to have a better model than just path and cycleway, since some networks can get quite complex (consider quietways and cycle superhighways; or the multitiered systems in The Netherlands, for example).
On Tue, Feb 26, 2019 at 6:39 AM Paul Allen <[email protected]> wrote: > On Tue, 26 Feb 2019 at 12:17, Fernando Trebien <[email protected]> > wrote: > >> >> I don't think a uniform, worldwide highway class standardisation based >> on road attributes is possible and satisfactory. But I think a >> functional one would be, at least as a guiding principle. >> > > What we currently have doesn't reflect reality too well, even in the UK. > It makes the > assumption that the width/capacity/speed of a road correlates well with > its classification. > Of course, we have lanes and speed limits to refine matters, but there is > still the implicit > assumption by many mappers that a primary route is "better" than a > secondary route. > > It's sort of true, in the UK, most of the time. But it is possible for a > primary route in the UK > to have fewer lanes or lower speeds for part of its length than a > secondary route between the > same two locations. Unlikely, but possible. Road classifications in the > UK are essentially > hints to the routeing algorithm in drivers' heads. A primary route from A > to B is generally > preferable to a secondary route because of a combination of factors > including speed, width, > straightness, length, junctions (lights or roundabouts), surface, and > signage. On any single > one of those metrics the secondary may be better than the primary, but > overall the primary > is preferable. A secondary route in one locality may be better in all > respects than the primary > in a different locality but that route is a primary because it is the best > route (for some values > of "best") betweentwo important locations. > > Is this a good way to model thing? Probably. Because anyone in the UK > looking to get from A to > B will consider primary routes first, trusting that the authorities have > evaluated matters and that > the primary routes are (normally) the best routes to choose. It's not > perfect, which is why satnavs > usually offer the choice of looking for the fastest or shortest route. > But if all you have is a paper map, > then knowing which are primary and secondary routes is useful. > > -- > Paul > > _______________________________________________ > Tagging mailing list > [email protected] > https://lists.openstreetmap.org/listinfo/tagging >
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