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

[John Smith]

2009/8/31 Anthony <osm at inbox.org>:

> Unless I'm misreading this, anyone going from 4th Avenue onto Rodeo Drive
> has to stop, and everyone going from Roxton Ave onto Rodeo Drive has to
> stop.  That, in my opinion, has nothing to do with lanes.  I'm not sure why
> it's so important to model in the first place (you'd have to slow way down
> and just about stop whether there was a stop sign there or not), but a
> relation would probably be the best solution here.  I'm not sure what the
> local law is, but where I live the requirement to stop is determined by the
> relation of the two roads, not the presence of the stop sign.  The stop sign
> is just a reminder.

Why is a relation the best solution?

Regardless if it's common sense or not to slow/stop it's a legal
restriction, however it only applies to one direction similar to a
traffic calming device that only applies to one direction, however in
both case it doesn't apply to the entire way, it just applies to a
single lane of the way.

Just like there is motorway lanes that have different maxspeeds
depending what lane you are in, it would be pointless to do this in a
relation, but being able to tag lanes with individual restrictions it
would solve a number of issues, not just stop signs.

> Whoever provided Google with their data split the way in the example I
> provided, and does so in pretty much any situation where you need to be in a
> particular lane in order to get where you want to go.  In my opinion paint
> which disallows lane changes should be equivalent to a physical gore area as
> far as mapping applications are concerned (with allowances for
> approximations in micro areas and lenience when everyone is going straight
> and it doesn't really matter).

At this stage only physical barriers are drawn as separate ways, that
isn't really the point of this thread, the point is the best way to
tag nodes or other restrictions on a per lane basis.

> The example you gave has none of that, of course, but I see no reason to
> split the way.

You are the only one talking about splitting the way, I just want to
tag a subset if there is a reason to.