[Talk-GB] Unfit for motors - tagging for routing

Aidan McGinley aidmcgin+openstreetmap at gmail.com
Mon Dec 10 14:30:12 GMT 2012


motor_vehicl <http://wiki.openstreetmap.org/wiki/Key:motor_vehicle>e=no
should suffice I would have thought?

On 10 December 2012 13:36, cotswolds mapper <osmcotswolds at gmail.com> wrote:

> There are lots of roads where I map which have "Unfit for motors" signs
> (blue/white advisory) but are normal maintained roads in limited but
> regular use. Typically they are narrowish, with lots of bends and often
> steep. In general anything up to maybe the size of a skip lorry can get
> through (though some are too narrow), but what makes them unfit for motors
> is very long stretches without passing places,so if you meet something
> coming the other way, one of you has a very long, difficult reverse.
>
> They are currently tagged in OSM as minor roads, which of course means
> they are eligible for routing. As an example, most (all?) routing services
> (not just OSM-based, Google Maps has the same problem) will route Chalford
> Hill to Stroud along Dark Lane, but Dark Lane has an "Unfit for motors"
> sign.  It's the shortest and most direct route from the A419 to most of
> Chalford Hill, but very few locals use it.
>
> I'd like to tag these roads so that routing services will avoid them, but
> can't find any direct way of doing this. I've seen elsewhere that one
> mapper has tagged similar roads as Service roads. This has two advantages:
> routing services will ignore them(?); and service roads render differently
> so anyone using the map visually will be less likely to use these roads.
> It's pushing the current definition of service road rather a lot, but if
> you consider a service road to be a road that should only be used to access
> locations connected to the service road, then it seems within the spirit of
> the definition.
>
> There's a specific issue with Chalford Hill at the moment. Road closures
> (due to collapsed retaining walls) mean that the popular routes to the
> valley (Old Neighbourhood and to a lesser extent Coppice Hill) are closed
> and likely to remain so for over a month. My local source (a parish
> councilor) says that most locals are using a long diversion and avoiding
> Dark Lane. (Traffic on Dark Lane has increased, and there was recently a
> fist fight when two cars met and neither driver would reverse. Locals want
> to make it temporarily one way, which would massively increase its
> usefulness, but there's no quick way of doing this.)
>
> My two questions:
>
> 1) Should OSM data discourage use of routes that locals -  who are likely
> to be better than outsiders at coping with narrow lanes - avoid as too
> problematic;
>
> 2) Is tagging usable but 'Unfit for motors' roads as service roads an
> acceptable way of doing this or is there a better method (that is
> recognised by current renderers and routing engines).
>
> As my opinion on (1) is yes, I've tagged Dark Lane and a couple of even
> more difficult roads as service roads, at least for the duration of the
> road closures, but will happily revert the tag if there's a better way.
>
> Rob
>
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