On Thu, Oct 24, 2019 at 7:55 AM Paul Allen <pla16...@gmail.com> wrote:
> On Thu, 24 Oct 2019 at 13:30, Paul Johnson <ba...@ursamundi.org> wrote: > >> On Thu, Oct 24, 2019 at 7:20 AM Paul Allen <pla16...@gmail.com> wrote: >> >>> >>> Necessary, but not sufficient. It doesn't just have to be physically >>> treaversable, it has >>> to be legally traversable. >>> >> >> Eeeh, I think that's a bit of a grey area, like stopping on yellow lights. >> > > Yes, but there are rigidly defined areas of doubt and uncertainty (at > least in the UK): > "All vehicles MUST pass round the central markings except large vehicles > which are > physically incapable of doing so." UK mini roundabouts are signed as > such, so while > there may be doubt and uncertainty about how large the vehicle is and the > necessity > of going straight across, there's no doubt whether it is a mini roundabout > or not. > > Does the example roundabout have signage defining the central island as > legally traversable? > Does the unbroken white line around it indicate vehicles may not cross > it? What do the > traffic regulations say about roundabouts in general? Is this a real > roundabout built on the > cheap and the island happens to be physically traversable but not legally > so or do the > regulations say "If you can physically drive across a roundabout then you > may do so if > your vehicle is too large to go around"? > > That particular example is tough to decide just from imagery. It's a > fairly tight circle. But > those split lanes make me shudder when I think of vehicles going straight > across. I'd > hate to map it as a mini roundabout if legally it isn't and then some > router happily tells > a driver to drive straight across; or to map it as a roundabout when > legally it isn't and > the router tells the driver to do a 360. There might be legal > consequences if OSM > adopts a cavalier attitude to these things. Traffic regulations are even > more important than > physical appearances. > I hate to be a stick in the mud, but whether or not it's legally traversable doesn't seem to have much bearing on whether or not it's physically traversable. It's kinda like mapping a flush median in this case, it's not a seperate way so just a node indicating that there's a mini roundabout would be appropriate similar to how we don't map divided single carriageways with a flush median as two seperate ways.
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