[Tagging] barrier enforcing maxwidth

[johnw]

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 <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 <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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