>the similarity with the single truck-sign

Even the maxlength traffic sign is more similar with the "single truck" sign.

As to tagging the este vehicle+trailer weight limits, I haven't tagged any such 
vehicle combination limits before. Intuitively, though, I'd go with

maxweight=50 (the limit still applies also if you don't have a trailer) +
maxweight:combination=50 (or some other word, like :train)


>signed the vienna convention on traffic signs

I'm starting to see this convention mentioned all too often, in contexts where 
it has little relevance to tagging the properties of road objects in OSM. The 
text exists to make sure drivers can reasonably operate their vehicles abroad, 
not to dictate what signs may ever be used, or the legalese behind every 
traffic sign one can see. Parties to the convention can introduce new signs 
where needed and where the text doesn't offer one "as is". Most states even 
made some other reservations, I haven't bothered to read them through.

Local law always supercedes that convention, and different things may (or may 
not)  require different tags.

--
alv

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