On 09/07/2014 01:08, David Bannon wrote:
I don't really care exactly how it is done as long as we end up with a
clear model advising people whether or not they should attempt a
particular road. I have posted references to lost lives as a result of
bad decisions. Its easier to get people to take notice of simply
presented data. Too much detail scares most people ....
My pet solution was based around tracktype= with two legs, (a) we
reassert that tracktype= applies to all highway=, not just
highway=track. This was the original intention. (b) extend the five
grades by another three, being 4wd recommended, required and extreme.
This would completely redefine the current meaning of tracktype which I
think would be a very bad idea considering the widespread use of this
tag. Extending with new values that are of a completely different class
than the current values would be confusing.
Another approach is to make wider use of 4wd_only=yes. Extend it to have
the 'recommended' and 'extreme' values. I was advised that tags starting
with a number were a problem in mapnik but others have dismissed that
and a new default render has taken over now.
I prefer the tracktype= model as it has pretty wide use world wide,
4wd_only= does not yet get much use outside of Australia.
Please see Unsealed and 4wd roads in -
https://wiki.openstreetmap.org/wiki/Talk:Australian_Tagging_Guidelines
Some more ranting on my wiki page (inc discussion)
https://wiki.openstreetmap.org/wiki/User:Davo
Instead of trying to tweak existing tags I would propose a new tag to
indicate suitability for different types of vehicles. The following
scheme can be applied to all unpaved highway types.
vehicle_suitability=
class 1: The road is suitable for 2WD vehicles with normal clearance.
class 2: 4WD recommended. 2WD vehicles only with experienced driver.
class 3: 4WD required. 2WD vehicles unlikely to be able to pass.
class 4: 4WD and high clearance required.
I think this should fit most dirt roads and tracks around the world.
Would it be worth a proposal?
Ole
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