[Talk-us] NJ mass road demotions?

Richard Fairhurst richard at systemed.net
Mon Jun 12 18:55:51 UTC 2017


Kevin Kenny wrote:
> Is there *anyone* that actually can speak to what *is* common 
> practice in the US? When I've asked, I've always drawn a lot of 
> replies and come away more confused than before.

I've been doing vast amounts of rural TIGER fixup over the past couple of
years and this is what broadly seems to be what I've seen, bearing in mind
standard practice in other developed countries and the idea that the
highway= tag combines the importance in the highway network with some
assurance of construction quality:

* highway=motorway: interstate or other long-distance restricted-access road
* highway=trunk: fast, busy State Highway or US Highway, often NHS/STRAHNET
* highway=primary: major State Highway or US Highway
* highway=secondary: other State Highway or major County Road
* highway=tertiary: other through route, often a County Road, usually paved
with centreline
* highway=unclassified: rural minor route, sometimes a County Road, paved
unless tagged otherwise
* highway=residential: minor public road intended for residential access
rather than through route, paved unless tagged otherwise
  (N.B. currently not safe to assume paved in rural areas where
tiger:reviewed=no)
* highway=track: ungraded or rough, but usable by some four-wheeled vehicles

There are many, many variations, especially because the US doesn't have a
single nationwide system like most European countries, but if I had to sum
it up in a few words I'd choose the above.

cheers
Richard



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