The term "HGV" is not actually legally defined in the UK. Goods vehicles
start from 3.5T MAM. There is a special driving licence group D1 which
allows you to drive up to 7.5T, but the difference is in the licence,
not the vehicle.
The sign with an image of a lorry is used for a so-called "environmental
restriction", e.g. to keep trucks out of residential areas.
The sign with just a weight like "5t" is normally a physical
restriction, due to a weak bridge for example, and therefore has to
apply to all vehicles.
In order to distinguish between an environmental restriction and a
physical restriction, we have been using maxheight:physical=* and
maxwidth=* for the physical size limits. Maybe we can apply the same
pattern to maxweight?
In the UK both types of weight limit refer to the MAM/MGW, not to the
current weight. I agree that the OSM wiki is ambiguous in this regard.
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