I’m hoping for an agreed set of guidelines that could be added to the maxwidth:physical and / or barrier=bollard wiki entries which would make it easier to know what to measure, perhaps with why?
I have mapped the gap between bollards, or around a bollard, and there are some common problems which I try to avoid when choosing which gap to measure, as all of these vehicles would have difficulty in negotiating any gap which involves;
a high kerb, or
ground which has a steep sideways slope, or
ground which always has extremely deep & muddy conditions (small wheels would get stuck), or
such dense undergrowth that it effectively blocks part of the route
I see your point and I think a photo of a case where the physical maxwidth is larger than what can be used by the vehicles you list could help the discussion.
A list with the width of vehicles can be already put on the Wiki I think.
I am not sure how often it is the case that the physical maxwidth is larger than what can be used by the vehicles you list but if it is substantial I think a separate maxwidth:vehicle or something could be an option.
/*
Searches the visible map area for bollards with a maxwidth:physical
dimension of less than 80cm
*/
[out:json][timeout:25];
// gather results
nwr["barrier"="bollard"]["maxwidth:physical"~"0.[0-7]"]({{bbox}});
// print results
out geom;
I can be wrong but the photo you shared it looks to me the physical width is the same as the maximum width for a vehicle that can pass. The ground here can be an obstacle for small wheels but for that there is the surface key.
Thank you - I’m now thinking that the wiki entry for maxwidth:physical doesn’t need anything added to it - I’d be interested in any other suggestions though.
The question is - what to tag when there are several different widths (left / right of the bollard, in-between the bollards if there are several or if there are other obstacles)?
If that question can be answered with “the greatest of these”, then especially for barrier=block the question remains what would be the usable max width for paths without a clear delimitation - e.g. a block in the center of a forest path or similar.
The question is - what to tag when there are several different widths (left / right of the bollard, in-between the bollards if there are several or if there are other obstacles)?
maxwidth:physical means you only tag the widest width
The maximum width of a vehicle or other object (pram, pushchair, wheelbarrow…) that is physically able to pass the barrier?
For your boulder blocking a dirt path in the forest, if the path just has moss growing on either side of it and you can just walk around it, then you are not really being blocked. But presumably there are trees or dense undergrowth somewhere nearby, so the boulder is blocking something from using the path, so the distance between the trees and boulder could be measured.
Sometimes it’s really hard to say where the blocking stops, and usually, it’s got more space than a regular vehicle needs. There’s also boulders limiting the height:
