On Tue, Mar 4, 2008 at 12:09 AM, Alex Mauer <[EMAIL PROTECTED]> wrote:
> Karl Newman wrote: > > > > Agreed. The criteria listed on the Wiki page promote too many highways > > to "motorways". It's too hard to distinguish between them; in dense > > urban areas you could end up with a lot of "motorways". It seems to me > > the "motorway" tag should be reserved for interstates, with some > > exceptions for major US highways. You left out "tertiary" from your > > descriptions. I would see "tertiary" as an important thoroughfare road > > through a town--higher speeds and less traffic controls than > > "unclassified". How about these guidelines, based on speed limits and > > lanes: > > > > * motorway: Interstate, 2+ travel lanes, ramp access only, speed > > limit 65 MPH+ > > * trunk: US highway, 2+ travel lanes, ramp access only, speed limit > > 60-70 MPH > > * primary: US highway, 1-2 travel lanes, or State highway, 2 travel > > lanes, speed limit 55-65 MPH, can have occasional > > stoplights/traffic controls > > * secondary: State highway, 1-2 travel lanes, or larger county > > highway, speed limit 45-55 MPH > > * tertiary: County highway, other unnumbered thoroughfare, speed > > limit 40-50 MPH > > * unclassified: urban commercial district or rural low-density > > housing, normally no direct driveway access to housing in urban or > > suburban areas, speed limit 30-40 MPH > > * missing_tag: It seems like there needs to be another > > classification for residential branch roads which are main roads > > through subdivisions but still have direct driveway access to > > housing. > > * residential: urban or suburban roads primarily for providing > > access to housing, speed limit 15-25 MPH > > > > I agree, with the modification that trunk doesn't need to be ramp access > only, and that county highways are secondary. 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? 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. > I've used tertiary for the missing_tag you describe, as this seems to be > in line with the European tertiary roads. (these comments are also on > the wiki, I believe. > 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. Karl
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