On Friday 09 May 2008 21:57:51 OJ W wrote: > 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.
Don't forget tertiary. While there are only a handful of C class roads in the UK (I believe) local councils seem to flit between defining a number of roads as a C or a U and so for these roads either a tertiary or unclassified (or residential if it's applicable) tag makes sense Personally I use tertiary for roads which, while residential, are obviously through-routes and are used extensively as such. This includes roads which bisect housing estates (see Park Lane/Tempest Avenue at [1] and Stakes Hill Road slightly to the South). I feel this reflects their level of importance with respect to the surrounding roads without incorrectly tagging it as, say, a B-road. I feel this fits well with your definition of a residential road as "something you wouldn't use as a through-road, but only as a destination" by making tertiary be "a residential road you _would_ use as a through road". Matt Williams [1] http://openstreetmap.org/?lat=50.8845&lon=-1.01108&zoom=15&layers=B0FT
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