[Tagging] bridge=humpback ?

[Andy Mabbett]

risk_of_grounding=yes ?
On Aug 10, 2014 5:14 PM, "Colin Smale" <colin.smale at xs4all.nl> wrote:

>  It is neither constructed with the intention of calming traffic, nor is
> it intended as any kind of barrier (a bridge is usually exactly the
> opposite!) Let us not be afraid of using a different tag for what is
> clearly a different attribute.
>
> --colin
>
>
> On 2014-08-10 17:52, fly wrote:
>
> Can't we use traffic_calming=hump for this situation or some barrier=*?
>
> cu fly
>
> Am 10.08.2014 16:23, schrieb Colin Smale:
>
> No need to define it as UK-only... such bridges occur across the whole
> world, I am sure. The UK may be unique by having a specific road sign,
> which may indicate that a bridge could/should be tagged as a humpback (as
> stated in the wiki[1
> <http://wiki.openstreetmap.org/wiki/Road_signs_in_the_United_Kingdom>]).
> There is also a sign for explicitly indicating a "risk of grounding" often
> seen at railway crossings. In the UK it can be made objective by linking
> the use of the tag to the presence of the sign, but then we would miss the
> many bridges which "the average person" would call a hump bridge but are
> not signed as such. I would suggest something like "a bridge requiring
> driving speed to be reduced due to the vertical profile" (i.e. not because
> it is narrow, or some other attribute). Not sure this depends on who is
> driving by the way, the laws of dynamics apply to all of us equally. But I
> agree that calculating whether a particular truck can pass a particular
> bridge is not easy to put into simple tags. It can be rather complex, which
> is why products like [2 <http://www.autopath.co.uk/>] exist. --colin [1]
> http://wiki.openstreetmap.org/wiki/Road_signs_in_the_United_Kingdom [2]
> http://www.autopath.co.uk/ On 2014-08-10 15:34, Никита wrote:
>
> I'm fine with this tag being used in UK. But I care about it's definition.
> If this tag will be interesting only in some territory, why not to define
> this tag specific to UK? You didn't answer how we should define "humpiness"
> of bridge?.. Is this you who minority and cannot pass this bridge without
> speed reduction or it is me who can drive everywhere at regular speed? This
> is really subjective. 2014-08-10 16:47 GMT+04:00 Yves <yvecai at gmail.com
> <mailto:yvecai at gmail.com>>: There is a lot of things not of interest to
> the majority of users in OSM, this is why it is rich. Yves On 10 août 2014
> 12:41:22 UTC+02:00, Colin Smale <colin.smale at xs4all.nl <mailto:
> colin.smale at xs4all.nl>> wrote: On 2014-08-10 12:13, Никита wrote: I.e
> they define this tag as subtype of
> http://en.wikipedia.org/wiki/Arch_bridge [5]. I don't see any real
> application/use to bridge=humpback. Also, bridge=humpback does not imply
> covered=yes by default. It does not define routing aspects or adds any
> features to end users. In the UK there are warning signs for some humpback
> bridges, and with good reason - if you don't slow down substantially from
> the ambient speed you will be launched into orbit. Therefore they should be
> useful for routers, implying a lower speed on that part of the road.
> https://uk.answers.yahoo.com/question/index?qid=20120222085933AAsnJiP
> Some are so "humpy" that a vehicle with a long gap between the axles and/or
> a low ground clearance (e.g. a low-loader) may actually be unable to cross
> the bridge. So I don't think it is right to say that bridge=humpback cannot
> be of value for routing or end users... --colin
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