2010/9/16 Dave F. <[email protected]>: > On 15/09/2010 21:53, M∡rtin Koppenhoefer wrote: >> >> of course stop is also bad. traffic signals is bad as well. > > Err... Why?
because it doesn't work well. It is a simplistic approximation to indicate that a crossing is controlled by traffic lights but when it comes to details it's a complete fail / undefined. This is also explicitly written in the wiki: "As of now, there is no well established convention. " The wiki also explains why it is a fail: "The horizontal ways are actually one large way. The problem is how to make sure the "traffic_signals" is applied to all "ways". To make sure it applies to the two horizontal ways, we should add the tag to both nodes intersecting with the vertical way. But that'd make two separate traffic signals, and there is physically ONE set of traffic signals. " You can see by this picture (also from the wiki page) that the vertical way get's punished with 2 traffic lights where there is only one: http://wiki.openstreetmap.org/w/images/1/13/Rendering-traffic_singals.jpg You currently can't model situations where not all ways have traffic lights, we don't have information about cycles (e.g. many traffic lights in a row might all turn green at the same time, so they aren't that big a problem, or they might not, etc.). Cheers, Martin _______________________________________________ Tagging mailing list [email protected] http://lists.openstreetmap.org/listinfo/tagging
