[Talk-us] US highway classification

[Anthony]

On Sun, May 29, 2011 at 10:34 AM, Richard Welty <rwelty at averillpark.net> wrote:
> in short: a routing engine will probably use classifications where maxspeed
> data is missing, but probably only to derive guesstimates of maxspeed
> values.

Now that I think about it, that's actually an excellent reason why
classifications in the US should be by state.  Max speeds vary
significantly by state, as well as classifications of what roads get
what speeds.