On Thu, Feb 28, 2019 at 9:56 AM Martin Koppenhoefer
<dieterdre...@gmail.com> wrote:
> Am Do., 28. Feb. 2019 um 13:26 Uhr schrieb Fernando Trebien 
> <fernando.treb...@gmail.com>:
>> Currently, it actually would because emergency=* is nested under
>> motor_vehicle=* in the access tags hierarchy. [1] So to express that
>> motor vehicles (cars, trucks, etc.) are forbidden but emergency
>> vehicles are not, both motor_vehicle=no + emergency=yes are required.
>
> it depends on the specific implementation. Yes, there is an "emergency" key, 
> but it is not clear how people will interpret the absence of such tag. If you 
> assume that emergency vehicles in emergency service are not bound by legal 
> restrictions in general (not too far fetched IMHO), it implies emergency is 
> always "yes" unless tagged otherwise.

So access=no without emergency=yes may imply emergency=yes? That's not
written anywhere in the main articles on the topic [1][2]. If that's
the general interpretation, then emergency=* should not be nested
under acccess=*.

[1] https://wiki.openstreetmap.org/wiki/Key:access
[2] https://wiki.openstreetmap.org/wiki/OSM_tags_for_routing/Access-Restrictions

-- 
Fernando Trebien

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