[Talk-GB] Access tagging for buses and service=bus

Philip Barnes phil at trigpoint.me.uk
Mon Jun 12 15:27:41 UTC 2017

On Mon, 2017-06-12 at 08:58 +0000, Harry Wood wrote:
> I came across a few tagging quirks to do with bus access and
> specifically "service=bus"
> First of all there's some roads with service=Bus (uppercase B). So
> that's definitely a mistake.
> Only exists in a cluster in Manchester ...plus a small cluster in Sao
> Paulo!:
> https://overpass-turbo.eu/?w=%22service%22%3D%22Bus%22+global&R
> The idea of the service=bus tag is to allow a bus routing system to
> know that a service road is for buses, with the implication that all
> other service roads should be not for buses. That was a surprise to
> me. When I configured a bus routing system (doing this as part of my
> day job at TransportAPI), it didn't occur to me to disallow buses
> driving down service roads, but maybe I should rethink that.
> In any case it seems to me that the access tagging should be regarded
> as orthogonal to this. What I mean is, while we might tag a road as
> service=bus, we should also make sure that all these special roads
> for buses ...allow buses! If they're access=no, then we need to also
> make sure they are bus=yes (or psv=yes). Sounds reasonable?
> So I came up with this Overpass query to try to find those problems h
> ttp://overpass-turbo.eu/s/pDR  Not too many.
> Should we go ahead and fix those things? Quite a small job. I can do
> it myself actually.
> There are many other problems (bigger problems!) we could fix with
> bus data in the UK. For example an extension of this idea would be to
> check for access tagging on all ways which are part of bus route
> relations. And of course there's coverage of the bus route relations
> themselves. That's something we were discussing here as a possible UK
> quarterly mapping project: https://www.loomio.org/d/uBc7x1Ok/quarterl
> y-project-july-sept2017
Also don't forget the psv=* tag too, I suspect this should be more
common in the UK as it limits access to buses on public service and
most are also open to hackneys·

Phil (trigpoint)

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