[Talk-us] US highway classification

[Anthony]

On Sat, May 28, 2011 at 10:40 AM, Mike N <niceman at att.net> wrote:
> On 5/28/2011 9:12 AM, Anthony wrote:
>>
>> Trunk has no meaning beyond "color the road the same color as other
>> things that are tagged trunk".
>
>  Even color is not defined - some trunks can be toll / not toll.
>
>  However, trunk *could* serve as a router hint that the road is a better
> selection than primary / secondary.

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.