[Talk-us] Editing_Standards_and_Conventions for US Interstate highways

[Mike N.]

A post on the 'talk' email list on updating  the page at
http://wiki.openstreetmap.org/wiki/Editing_Standards_and_Conventions
got me thinking that something for Interstate Highways would be handy.

 Currently, the page http://wiki.openstreetmap.org/wiki/Interstate_Highways 
redirects to the relations page, which is fine when there's no other detail. 
But the page section at

http://wiki.openstreetmap.org/wiki/North_Carolina#Interstate_Highways

  Would be a good start.  Does it make sense to have a national convention 
for Interstate Highway editing?   Those conventions would seem to apply to 
the whole US when updated for Relations.


  Some Interstate questions in general -

 Is there any use for the 'nat_ref' tag since a relation seems to be a 
better representation of the Nationally Referenced function?
 Should roles for direction be used when the interstate signing convention 
include the direction?
  Should interstate exits be included as part of the routing relation?

 Rest area -
     Should the entrance and exit ramps be marked as motorway_link , while 
the rest stop streets be marked as type 'service' - or are all marked as 
'service'?
    Should the Rest stop roads in general be included as part of the 
interstate route relation?


 Relations - general

    When does adding a relation to a road create a more useful map?
    What about for local primary and secondary roads?
    For a 2 mile "Interstate Spur"?