[Tagging] address numbers for non existent objects

[Georges Dutreix]

Hello,


Stevea suggested me to start a new thread explaining how an address 
might exist with no corresponding object in the real world.

I am sorry but I have been unable to find an english source describing 
what we call "metric numbering system". Let's have a look to this node 
(https://www.openstreetmap.org/node/8174470340#map=19/45.94903/4.62795) 
and to the addresses around the village. All numbers start from 1 on one 
end of a street/road, odd on the left, even on the right.

The address number matches the number of meters (or decameters) from the 
beginning of the road. If you are in the fields, 2820 m from the 
beginning of the road, with no houses around, there is already an 
OFFICIAL address number and it is "2820". This address can be used to 
indicate where starts a track, or where a company plans to put an 
antenna in the future. If there is a project for housing estate, some 
numbers might be added along the road before the first excavation.


In my opinion, the tag addr:housenumber=2820 is suitable and should be 
used in this case, even if there is no object in the real world. What do 
you think ?


Thanks,

Georges