At 2012-04-19 04:38, Martin Vonwald wrote:
* PSV lanes SHOULD be included (also [2]). Example: lanes=3 and lanes:psv=1 means we have three lanes and one OF THEM is for PSV only.
Same goes for HOV (high-occupancy-vehicles) lanes, unless they are separately mapped (which is a better solution for routing, given their controlled access).
* Turn lanes SHOULD be included (see [2] and [5]). * The lane count should change, as soon as a) new lane has reached its full width or b) a lane starts to disappear (usually a merge with another lane) (also [5]).
Technically, yes, but it doesn't seem practical in developed areas in the US, which typically change lane configurations at every major intersection and then change back again. A typical secondary artery might be 2 lanes in each direction with a raised center island, expanding to 2 lanes in one direction and, in the other direction, a left-turn "pocket" (in place of the center island), 2 straight-ahead lanes, and a right-turn "pocket" (in place of some land or sidewalk on the right side). While these additional lanes can be added individually or the way broken to tag them, I just don't see people doing this. It seems like routers could just as easily assume these types of configuration between various road classes, unless told otherwise. I would tag such a road as lanes=4 (lanes=5 if the center island is, instead, a center turn lane).
- Two-way roads with a specified lane count, but without a specified lanes:forward OR lanes:backward and a lane count, that is divisible by two, are assumed to have half of the lanes in each direction, e.g. lanes=4 means two lanes in each direction if not specified otherwise. I will add a recommendation for this situation, to add explicit values.
If an odd number, assume a center turn lane (e.g. lanes=5 means 2 forward, 2 backward, 1 center).
+1 to the rest. -- Alan Mintz <alan_mintz+...@earthlink.net> _______________________________________________ Tagging mailing list Tagging@openstreetmap.org http://lists.openstreetmap.org/listinfo/tagging
