[Tagging] Feature Proposal - RFC - Gross vehicle weight rating

[Rob Nickerson]

I've just checked the UK road sign guidance too [1].

Section 5.15 (page 35 describes the sign with the image of a HGV and a
weight restriction number. It clearly states that this is a restriction for
"environmental reasons" (e.g. where roads are narrow and unsuitable for
large vehicles, or to protect residents from the nuisance caused by lorries
in residential streets) and is not used for "structural limits". It appears
that this is a Gross Vehicle Weight Rating (GVWR) from the sentence stating
that the limit applies even if unladen and below the weight.

Section 5.31 to 5.33 gives the other sign (the one with a weight limit that
applies to all vehicles). Again this is a maximum weight rating:
"Specifying gross vehicle weights makes enforcement simpler as it is
necessary only to check the vehicle’s plated weight against that on the
sign, eliminating the need for a vehicle to be taken to a weighbridge for
checking." Annoyingly this is complicated by the possible additional of a
bottom panel reading "Except empty vehicles".

Conclusion - in the UK all weight limits are Gross Vehicle Weight Rating
limits and thus maxweight=* and hgv:maxweight=* would be enough. The
"Except empty vehicles" is an interesting condition and could be tagged as
maxweight=18 + maxweight:conditional= no @ empty vehicle (or something
similar).

How does this compare to other countries?

Rob

[1]
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/4460/traffic-signs-manual-chapter-03.pdf
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