I use "maxwidth" to map the max width road signs, which represent a legal access restriction, not necessaryly a physical acess restriction.
I use "width" to tag the physical width of a road. If there is an object on the road that physicslly limits the width of the vehicles you can use the tag barrier=block like this barrier=block material=concrete maxwidth=2 vehicle=yes foot=yes Replace concrete with metal and you have a tag for your metal-pole width restrictor Volker Padova, Italy
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