[Talk-us] US highway classification

[Nathan Mills]

 On Sat, 28 May 2011 15:19:03 -0400, Anthony wrote:

> In my experience the difference between primary and trunk is 
> generally
> very minor, to the point where I'm not sure there'd be any advantage
> at all in a router using it as a hint.
>
> But maybe that's just because the places where I use OSM are mapped 
> wrong.

 Using NE2's criteria, trunk is not really any different from a routing 
 standpoint than primary. Using mine, trunk is something that would be 
 primary if it weren't a physically better sort of road, so should be 
 preferred over a nearby primary if the distances are similar. I'm 
 harping on physical characteristics for this one particular tag because 
 I think without that as a differentiator, it's basically useless fluff 
 we shouldn't be using at all because primary already covers that usage.