[Tagging] Emergency Access

[Andreas Goss]

So I got a bit of work done with the WikiProject Emergency Cleanup, but 
now I'm not really sure about emergency access.

- Is there a difference between service=emergency_access, 
access=emergency and emergency=yes(on roads)?

- What exactly is their meaning? Is it only for designated emergency 
access roads (https://de.wikipedia.org/wiki/Feuerwehrzufahrt)?

- Are there even any roads where emergency vehicles usually aren't 
allowed to drive and you then have to indicate if they are allowed? Like 
when would you use emergency=no ?

- Or was it meant for roads, which bascially had access=no, but allowed 
for only emergency vehicles?


The only thing I could find apart from a mention on the access=* page 
was this proposal: 
http://wiki.openstreetmap.org/wiki/Proposed_features/emergency_vehicle_access


I'm considering starting a proposal for something like 
access:emergency=yes/no/designated/..., because using access=* means you 
can't combine it with a different access attribute and‎ emergency=yes 
says very little and is also used on other things.