[OSM-newbies] Question about how to connection correctly highway links

[Sebastian Arcus]

Thank you Phil


On 17/12/12 09:52, Philip Barnes wrote:
> Hi Sebastian
>
> The road classification is something that can only really be gleaned
> from a survey, as you travel around. There is no other source that I
> know of that can be used legally.
>
>   Cheers Phil
>
> --
>
> Sent from my Nokia N9
>
>
> On 17/12/2012 8:12 Sebastian Arcus wrote:
>
> Thanks Phil. I have to say although I live in UK, I've never noticed
> until now that some A roads are green and others are black.
> Incidentally, would this information be gleaned just by driving around
> on the ground and looking at road signs, or is there another source of
> classification?
>
> Sebastian
>
>
> On 16/12/12 23:58, Philip Barnes wrote:
>  > Hi Sebastian
>  >
>  >> Thanks for the extra info. I will download a fresh copy of maps for
>  >> Navit with the restrictions in place to make sure that junction works as
>  >> expected. I kind of figured out Navit's navigation must have thought
>  >> that route would have been shorter or better somehow - but in real life
>  >> it wouldn't have been a viable one.
>  > Routers do seem to overuse road classification, it works with motorways
>  > but in built up areas classification is largely irrelevant. In the
>  > example you gave Navit is assuming that the trunk road is faster, even
>  > if its just by a second or two. In this case it wont be faster. Even if
>  > it was legal, there is a 90 degree turn.
>  >
>  >>
>  >> I must admit I haven't figured out yet the business with trunk roads - I
>  >> always sort of assumed based on OSM's wiki that "A" roads in UK are
>  >> primary highways - clearly I must go back and read the OSM highway
>  >> classification again.
>  > You do need to read the OSM wiki page, WikiProject United Kingdom A and
>  > B Roads at
>  >
> http://wiki.openstreetmap.org/wiki/WikiProject_United_Kingdom_A_and_B_Roads
>  >
>  > Quote from the page:
>  > In the UK, the OSM rule goes like this:
>  >
>  > green signed A roads: highway=trunk
>  > black-and-white signed A roads: highway=primary
>  > B roads: highway=secondary
>  >
>  > (It might sound confusing if you're used to hearing A roads described
>  > differently. Sorry, it's just how we do things round here.)
>  > /end quote
>  >
>  >
>  >> It doesn't quite help the fact that tertiary
>  >> highways correspond to "C" roads, and secondary highways correspond to
>  >> "B" roads - thus living primary highways without a direct correspondent
>  >> in UK.
>  > Tertiary roads are a bit of a black art, there are very few C roads
>  > numbered on the ground and unless you have access to council info you
>  > will not easily get hold of the numbers.
>  >
>  > I tend to tag the main unclassified roads through an area as tertiary,
>  > the ones that are used by through traffic, but I may be wrong.
>  >
>  > Regards Phil
>  >
>  >
>  > _______________________________________________
>  > newbies mailing list
>  > newbies at openstreetmap.org <mailto:newbies at openstreetmap.org>
>  >
> http://wiki.openstreetmap.org/wiki/WikiProject_United_Kingdom_A_and_B_Roads
>  >
>
>
> --
> Linux vehicle CCTV - www.open-t.co.uk/iroko <http://www.open-t.co.uk/iroko>
>
> _______________________________________________
> newbies mailing list
> newbies at openstreetmap.org <mailto:newbies at openstreetmap.org>
> http://wiki.openstreetmap.org/wiki/WikiProject_United_Kingdom_A_and_B_Roads
>
>
>
>
> _______________________________________________
> newbies mailing list
> newbies at openstreetmap.org
> http://lists.openstreetmap.org/listinfo/newbies
>


-- 
Linux vehicle CCTV - www.open-t.co.uk/iroko