The problem is that emergency is used for both access rules (a permission) and for features, see http://taginfo.openstreetmap.org/keys/emergency#values This means that you can never restrict/allow access to a feature in the "emergency"-tag group (fire stations, fire hydrants, etc.) for "emergency"-vehicles, in case you ever need this.
You can't have emergency=<some feature fire_station, water_tank, etc.> vehicle=no emergency=yes on 1 object. don't know if someone want to do something like this, or whether it is useful at all. Still I think the two uses should use different keys. (e.g. use emergency_vehicle for permissions). regards m On Tue, Jun 23, 2015 at 4:13 PM, André Pirard <a.pir...@ulg.ac.be> wrote: > On 2015-06-23 11:54, Marc Gemis wrote : > > > On Tue, Jun 23, 2015 at 11:11 AM, Ruben Maes <ru...@janmaes.com> wrote: > >> It is currently tagged vehicle=no + emergency=yes. >> I would go even further and say access=no + emergency=yes. >> >> >> > > The problem with this way of tagging access rights for emergency vehicles > is that you cannot combine it with the other emergency tags. > Suppose there is a water tank with only permission for emergency, you are > stuck. > > while > > emergency=water_tank > access= emergency > > works. > > That might be a reason to stop using emergency=yes for access and leave > the emergency tag for features. IMHO, we should not combine a tag used for > access rights and for features. > > > p.s. the example above might not be the best. > > emergency=* is a permission. > Stating a permission without a restriction is like doing nothing. > GPS (routing) software will forbid nothing. > As Rubin writes, a *=no is needed first to disallow something. > vehicle=no > emergency=yes > Will disallow vehicles except emergency ones. > > Suppose there is a water tank with only permission for emergency, you are > stuck. > ... > emergency=water_tank > access= emergency > > What do you mean exactly? > emergency=* and access=* can only used with yes or no. > Else, GPS (routing) software will not understand. > It means that the emergency category of vehicles is allowed, > not that anything is allowed in case of emergency. > > GPS software uses strict logic to apply strict wiki rules. > > André. > >
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