On 4 Jun 2009, at 17:11, WessexMario wrote: > Robert Naylor wrote: >>>> On Thu, 04 Jun 2009 11:13:28 +0100, David Earl >>>> <da...@frankieandshadow.com> wrote: >>>> >>>> >>>>> I also came across someone tagging maxpeed=NSL yesterday. If it >>>>> gives >>>>> someone happiness, fine, but I don't really think it should be >>>>> necessary >>>>> to tag the default situation, only when there is an exception to >>>>> the >>>>> general rule >>>>> >> This page seems to confirm this: >> http://www.abd.org.uk/know_your_speed_limits.htm >> >> > There is a major problem with using maxspeed=NSL. > Dual Carriageways. > How will the applications know that a way is part of a dual > carriageway > or is just one oneway way that happens to be near another oneway way?
Here is a proposal for using relations to combine carriageways and also one for collecting together all the slip-roads into a single feature called 'junction':- "To avoid duplication, the name/ref of the street should continue to be placed on the Ways of the street or in the Relation for the collected ways of a street. This relationship is only intended as a hint to renderers that the adjacent ways are actually part of the same street/road so the name could be positioned between the carriageways rather than in both, or the road number rendered only once for adjacent pairs of ways and similar applications. http://wiki.openstreetmap.org/wiki/Relations/Proposed/Dual_carriageways And this one for interchanges "The main purpose of the Relation at present is to give renderers or route planners a name and or number for a junction. It also means that a staggered cross roads controlled by linked traffic signals can be grouped into the one junction while still maintaining the geometry of the streets correctly. http://wiki.openstreetmap.org/wiki/Relations/Proposed/Junctions Regards, Peter > > > > > _______________________________________________ > Talk-GB mailing list > Talk-GB@openstreetmap.org > http://lists.openstreetmap.org/listinfo/talk-gb _______________________________________________ Talk-GB mailing list Talk-GB@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-gb
