On Mon, Sep 21, 2009 at 8:57 PM, Martin Koppenhoefer <dieterdre...@gmail.com > wrote:
> 2009/9/22 Anthony <o...@inbox.org>: > > It is possible to represent different surfaces and different maxspeeds > > without using more than one way. "maxspeed:lane=130;110"; > > "surface:lane=asphalt;concrete". That's not necessarily the best > solution, > > indeed, it won't be understood by none of the apps that are using our > data and it doesn't say, which lane has which value... > There would obviously need to be a standard, formed through a proposal, first. :) Left to right when the way is pointing up? > Different turn-restrictions is already possible. If you have a three lane > > way with two lanes going straight and one turning right, you join three > ways > > at one node: one with three lanes, one with two lanes, one with one lane. > > If you have a three lane road with two lanes going straight and one lane > > going straight or turning right, ditto, except the way going straight has > > three lanes instead of two. Which lane is which is determined by the > > geometry of the ways as they come out of the node. > > but that's exactly what I propose (map lanes explicitly) and it's > against the separate-ways-only-when-physically-divided-paradigm > (because an ambulance could change from one way to another)... > If you're going to go with the separate-ways-only-when-physically-divided-paradigm, aren't you better off using boundary relations rather than ways? I meant the lanes for acceleration and breaking (when going on or from > a highway). Usually there will be ~100mtres for this where you can > change at any time, but in OSM you have to decide on one merging > point. True... Perhaps it's a mistake to try to combine the physical and the logical into one in the first place. How about using ways to represent the suggested paths of travel, and boundary relations to represent the physical road structure? If you want to represent the physical road structure, mapping all the lanes doesn't even cut it. When two lanes merge or diverge, they don't leave nice little "lanes" of paved roadway in between them, they leave sections of roadways that would be better described with polygons or boundary relations rather than lanes.
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