[Tagging] tagging no truck access in US

[Richard Mann]

HGV = Heavy Goods Vehicle. It seems to be broadly identical (give or
take a couple of tons/tonnes) with a US "truck"

so hgv=destination (or hgv=no) would seem to be correct

Feel free to add a note on the wiki that hgv is en-gb for "truck"

Or feel free to use truck=destination (or truck=no), and if it catches
on put it in the wiki.

hgv is currently running at about 20000 uses in Europe, truck only 10

Richard