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<blockquote type="cite" cite="mid:rjqrvt$vne$1@ciao.gmane.io">I
expect the "width" of a way to be the actual width of the object
it represents.
</blockquote>
It depends on how we define "highway" in the OSM sense. You could
also assume that sidewalks etc. are "sticking" on the highway merely
for pragmatic reasons. Depending on the point of view, sidewalks and
highways represent different entities. (There is no law definition
here, I only find a German court decision that deals with street
widths and thus means the distance between the curbs, with
carriageway and parked vehicles, so as definition 2 above.)<br>
<br>
But I agree that it would be better to always specify which width is
meant exactly when mapping widths on streets (especially to use
"width:carriageway" for the rating of traffic suitability).
Nevertheless, a default, which meaning of "width" is meant without a
prefix/suffix, would still be helpful. Fun Fact: On the wiki highway
page - in contrast to what is discussed here - it says since 2012
that "width" means the width of the carriageway (but it does not
look like this paragraph has ever been discussed):
<a class="moz-txt-link-freetext" href="https://wiki.openstreetmap.org/wiki/Highways#Surface.2C_width_and_lighting">https://wiki.openstreetmap.org/wiki/Highways#Surface.2C_width_and_lighting</a><br>
<br>
Alex<br>
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