[Tagging] barrier enforcing maxwidth

[Andrew Errington]

So tag a short section of the road before and after the bridge with a
maxwidth tag.  It could differ from the maxwidth of the bridge, but routing
software should determine the minimum maxwidth for any section of a route
(and avoid or penaliseit accordingly).

On 8 September 2015 at 14:59, John Willis <johnw at mac.com> wrote:

> Im talking about how to tag the barrier. That thing was **tight** and very
> unusual to find in a major urban area.
>
> The amount of scars on the poles was amazing.
>
> The hight restriction barrier (a common thing) is tagged along with
> maxheight - this barrier seemed to be the same - if you are over max you
> will hit and severely damage your vehecle on the barrier - not the bridge
> or overpass or whatever.
>
> Javbw
>
> On Sep 8, 2015, at 1:52 PM, Andrew Errington <erringtona at gmail.com> wrote:
>
> I don't think a new tag is warranted.  maxwidth=* is fairly unequivocal.
> If map users or routers want to interpret it as "max width, but probably
> not really, there's probably a bit of extra space, I mean, who's going to
> be that petty" then that's not your problem.
>
> Since most roads do not have a maxwidth=* restriction it is safe to assume
> that the road is suitable for any vehicle*, but if you add a maxwidth tag
> somewhere it is immediately clear it was done purposefully.
>
>
>
> On 8 September 2015 at 12:38, johnw <johnw at mac.com> wrote:
>
>> I was driving in Chiba and Saitama yesterday and encountered a couple new
>> types of barriers. I realized later one is traffic_calming=chicane.
>>
>>
>> The other one is all over rural Japan as traffic_calming=choker on rural
>> roads that could bypass traffic near the rivers, - but this one is not for
>> traffic calming, it is for enforcement of maxwidth of the bridge, similar
>> to barrier=hight_restrictor.
>> . They put very strong steel poles or guardrails along the sides and
>> center of the road at the maxwidth + 20 cm of a standard car.  car can pass
>> (barely, my mirrors were 5 cm away from each pole), but a large dump truck
>> cannot pass. Both are in areas where commercial dump trucks or other large
>> vehicles are nearby, but this one is used to enforce access to the narrow
>> bridge near a very very busy area to keep a massive traffic jam from
>> occurring from a stuck dump truck.
>>
>> https://goo.gl/maps/8KUw7  The maxwidth is signed and guardrails are
>> doing the job. This is width limited for the very narrow bridge in the
>> background.
>>
>> https://goo.gl/maps/3NT9X  The other direction. Poles are used.
>>
>> Is this a reason for creating barrier=width_restrictor ?
>>
>>
>> Javbw
>>
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