[Tagging] tagging of one-way cycle lanes

Paul Johnson baloo at ursamundi.org
Thu May 10 17:53:12 UTC 2018

On Thu, May 10, 2018, 00:29 <osm.tagging at thorsten.engler.id.au> wrote:

> The “lanes=count” key gives the number of full lanes for motorized
> traffic. This gives a good estimate for total carrying capacity for vehicle
> traffic on this road for software that isn’t too concerned about the
> details, or simply older software that doesn’t know about the :lanes suffix.
Conflating lane count with lane access is both inaccurate and confusing.

> If there are keys with the :lanes suffix present, then number of lanes
> specified by all of them must be the same, and the total number of lanes
> (including cycle lanes and such) is given by the number of lanes defined in
> the tags, there is no need to repeat the same number again in the
> lanes=count tag. If you simply make the lanes=count tag always represent
> the same number as the lanes specified in the :lanes suffix keys, then you
> could simply omit it completely, as it’s just redundant
Every editor that handles lane tagging will (quite correctly) ensure your
lane counts square up to the lanes tagging or loudly complain.

> Changing the meaning of the lanes=count tag after many millions of them
> have already been created makes the key useless as it can’t be relied on
> anymore.
I'd argue this has always been the case thanks to this glaring omission.
Just because someone doesn't think all lanes should count just because
bicycle thought that was a smart idea doesn't mean that it actually is, or
that leaving this information out makes lane guidance easier (it doesn't,
it makes it wrong).

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