[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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