[OSM-talk] How to tag lanes, not ways, was: Deprecating the use of Tag:highway=stop in favour of Key:stop

[Anthony]

On Sun, Aug 30, 2009 at 1:09 PM, John Smith <deltafoxtrot256 at gmail.com>wrote:

> 2009/8/31 Anthony <osm at inbox.org>:
> > What happens when the road goes from four lanes to six?  Should this be
> > recorded at every intersection which has a turning lane?
>
> I really need to stop feedint the trolls. Lanes only get tagged if
> they differ from the way to need it, the values of the way cascade to
> the lanes.


Right, and at an intersection which has a turning lane, there is a
restriction on a per-lane basis.  You can only turn left from the turning
lane - you can only go straight (or possibly right) from the other lanes.
 So do you propose splitting the way at every turning lane?

In any case when switching from 4 to 6 they should be split
> already anyway.


Which, if you read above, is what I said.  Of course, on a 2 lane, 2
direction road with a painted median which turns into a 3 lane road with a
turning lane, this isn't likely to be done.

> Once there was enough demand for it, I'd probably introduce "lane" as a
> type
> > of "way" and use relations to tie together lanes in places where lane
> > changes are allowed.  But I think we're quite a ways off from needing
> that.
>
> Why do we need to use relations at all?


I guess for the most part we don't.  We could just split the way up into
multiple lanes as necessary and then merge them back together.  Still no
need for an extra table or children, though.


> You are trying to push a square peg in a round hole rather than doing
> it properly.
>

I'd say you're the one who's doing that.
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