[Talk-us] "highway" tags in the US
hawke at hawkesnest.net
Tue Mar 4 07:24:19 GMT 2008
Karl Newman wrote:
> Okay, for trunk, how about *mainly* ramp access, with grade-level
> crossing access to side roads permitted, but without traffic controls on
> the highway where they meet?
Hmm, I don't think the ramp access should be a requirement. Agreed on
"without traffic controls on the trunk highway at intersections" though.
I can think of two highways in my area (central Wisconsin) that fall
under this; both are state highways.
> Re: County roads as secondary, I was thinking mostly of speed limits as
> a guideline for the classifications. There aren't a whole lot of
> numbered county roads here in California, so I don't have much to judge
> them by.
Around here the county roads vary widely in speed limit, anywhere from
30 to 55 mph. They all seem to be two-lanes (total, not per-direction),
with fairly narrow shoulders.
> So you would place unclassified above tertiary? I haven't spent much
> time looking at road classifications when I've been in Europe (I
> probably would now since I've joined OSM), but that seems to go against
> the existing guidelines.
No...I use tertiary as you describe "missing_tag":
"residential branch roads which are main roads
through subdivisions..." though, I don't see why it should be exclusive
to residential/subdivision areas.
I noticed now there's also a difference in your usage of unclassified;
As I use them, these are ordinary, unremarkable roads; if they were in a
residential area, they'd be highway=residential. So I put
"unclassified" down a level from where you do, in between your
missing_tag and residential.
The first part of your description of unclassified seems to fit there,
as well: "urban commercial district or rural low-density housing..."
I suppose we differ in that I feel that tertiary can scale: in a
residential area, it's the "main roads with fewer driveways", in a
commercial or industrial area, it's the main roads as well, and in rural
areas it's main roads which are not county highways.
I would not use "direct driveway access" as a factor for distinguishing
highways. Roads of all classifications except motorway may have direct
driveway access, especially in rural areas.
-Alex Mauer "hawke"
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