This page *tries* to explain the differences: http://wiki.openstreetmap.org/index.php/Highway
I suppose my summary would be something like: Motorway: motor vehicles only, always dual-carriageway, always has good level of emergency features, junctions are always grade-separated with slip-roads/on-ramps Trunk: like motorway, but legally allows non-motorised traffic Primary: a road large enough that you wouldn't dare to cycle on it if you wanted to live. Often dual-carriageway, but with a more sloppy approach to creating junctions. Secondary: goes from somewhere important to somewhere important, with lots of traffic. Unclassified: everything else Residential: something you wouldn't use as a through-road, but only as a destination Service: only used by a select group of people (e.g. local residents, or delivery drivers), and not somewhere that a stranger would venture onto but since the OSM system is based on the UK system anyway, it's easy over here because all the signposts' colours tell you what sort of road it is. p.s. TIGER import seems to make a *lot* of stuff "highway=residential", even when the road in question is hundreds of miles from civilisation... On Fri, May 9, 2008 at 7:51 PM, Jeffrey Martin <[EMAIL PROTECTED]> wrote: > Here is my list of traits. > > Lane width. > Number of lanes in each direction. > Number of bidirectional lanes not controlled by signals. > Number of bidirectional lanes controlled by signals. > size of shoulder > Center turn lane. > In lane parking. > Separate parallel parking. side of street > Separate diagonal parking. side of street > parking on shoulder > parking partially on shoulder > parking partially on sidewalk > access: ramps only, ramps and full intersections, intersections, t > intersections (divided highway). > divided by barrier > divided by median > divided by park > median width > pavement > > > > On Sat, May 10, 2008 at 3:30 AM, Jeffrey Martin <[EMAIL PROTECTED]> wrote: >> >> I was thinking about classifying roads in Korea. What criteria am I using >> when I put a road in a classification? >> >> I'm starting to think that my support of the current use of the highway >> tag was misguided. Maybe we should >> be more specific. >> >> I know some people say they don't want to be stringing tape measures >> across the road, but for most >> countries I think there are only a handful of standard sizes for lanes and >> shoulders. Once you know the >> sizes for your country you can pretty much just eyeball it. >> >> A name for each kind of road in a person's country could be set up as an >> editor feature. I select >> "mountain road 2" from my list and it fills in the number of lanes, lane >> size, shoulder size, etc. >> for me. >> >> Another option might be to have some kind of bot that fills in specific >> data based on country >> specific highway tags. >> >> I think the first option is probably better. Would it be too complex to >> base rendering on a combination >> of specific road traits? >> >> -- >> http://bowlad.com > > > -- > http://bowlad.com > _______________________________________________ > talk mailing list > [email protected] > http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk > > _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk
