> > 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. > > I haven't seen a proposed scheme yet that really deals with this > properly, they pretty much all pretend that a lane starts at a point. > Personally I don't think that figuring this out is necessary for > having multiple lanes, as we could continue the fiction that they > start at a point. It'd be nice, but not necessary.
You can usually be accurate if you're not afraid of having overlapping ways. Lanes do start at a point, they just commonly overlap with another lane at that point. But yeah, even if you get down to the lane level, you're still mapping logically and not physically. If you want to map the physical, I think you've gotta go with a boundary relation: landuse=right_of_way, surface=*. Hopefully you can keep the ways for routing purposes, though.
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