On Fri, 2012-03-09 at 13:22 +0000, Andrew wrote: > Andy Allan <gravitystorm@...> writes: > > > > > I'll bet it's to do with the US. > > > > I think that in the US we are mapping "freeways" as either > > highway=motorway (for freeways that cross state lines, i.e. > > Interstates) or highway=trunk (for freeways that don't). So, > > translating it to the UK, the "avoid freeways" option becomes "avoid > > motorways", but still disables both highway=motorway and > > highway=trunk. > > > > This is the same problem as Openmtbmap sending bicycles away from > highway=trunk roads and is really an ambiguity in the tag. In the US and > Germany it is used for less-than-motorway roads but in Britain, although some > roads tagged that way are like that, it is very often more-than-primary. > Thanks for that information Andy and Andrew.
That probably explains the reasons, and having looked at areas of Canada and Germany I am familiar with I can see that the usage of road classification tags is really not what I was expecting. I have never driven in the US so cannot really compare anything. In Canada the freeways are motorways, but green trunk roads are very few and far between. The roads I would expect to be trunk are primary, red. Many roads I would consider tertiary are marked as secondary, I really would not consider many of them to be B roads. I cannot find any tertiary roads at all. In Germany, the less than motorway road I am familiar with (Blue sign with a car) between Freiburg and Hinterzarten is tagged as Trunk where it is a dual carriageway and primary on the single carriagway sections. If I had been mapping it I would have used the motorway tag, as it has motorway prohibitions. Thanks again Phil _______________________________________________ Talk-GB mailing list Talk-GB@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-gb