While first to agree that all tags should be objective and verifiable where ever possible, I am afraid we have to recognise that in practice, some things simple cannot be done that way. Or am I wrong ?
4wd tracks ? There are simply too many factors at play here for us to measure, should we measure the height or spacing of corrugations, the 'softness' of sand, the depth of run outs, the narrowness, the slope, the wetness of the mud, the effect of weather on the track ? Even if we could, how could the average map user possibly comprehend the data ? Again, I say, we need to put data in there that is likely to be usable. In this case, the user wants advice on should they use the track in question. A model based on subjective judgements by mappers looking at the track. Those mappers have guidelines, can apply common sense, probably have some experience. Yes, errors will happen but most information will be "mostly right". The driver is already making subjective decisions about their own ability and that of their vehicle. Compare that to the alternative, no information, a map user assumes every track shown is suitable for them to drive ! Dangerous indeed. Here are a few examples of whats likely if we do nothing - http://www.abc.net.au/news/2012-11-07/25yo-man-dies-of-thirst-in-outback-queensland/4357380 http://www.abc.net.au/news/2012-11-05/search-under-way-for-two-missing-prospectors/4352996 http://www.abc.net.au/news/2012-03-21/human-remains-body-penong/3902758 http://www.abc.net.au/news/2010-01-10/family-spends-four-days-bogged-in-outback/1204484 http://www.abc.net.au/news/2012-11-19/camel-causes-car-crash-near-uluru/4379866 http://www.abc.net.au/news/2013-01-15/swiss-tourists-lost-in-the-kimberley-now-found/4466002 David . [email protected] wrote: >On Tue, May 14, 2013 at 10:51 PM, Ken Self <[email protected]> wrote: > >> Just jumping in here with some ideas. If you have an objective tag it is a >> function of the track. But if you have a subjective tag then it is a >> function of the user of the road/track. > > >A tag that is true for some and not true for others is not a good tag. e.g. >4WD_Suitability=Recommended may be true for some daring driver but not for >some other cautious driver. What I'm saying has been said many times before >-- please see http://wiki.openstreetmap.org/wiki/Verifiability. This >guideline is well-established and makes perfect sense to me.
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