I’m wondering how one would map a restriction like this:
The obvious answer is maxunladenweight=3500 kg but this sign is official, it is not legally binding in this jurisdiction - only a recommendation.
The other options I could think of were using the non-standard tag maxunladenweight:advisory=3500 kg or just leaving the restriction untagged.
Wondering what the community thinks?
& with a truck that’s clearly more than 3.5t behind it … 
(Although I grant that it may not be on New Windsor Rd)
Personally, I’d probably just stick with maxweight:advisory.
& that photo looks very Oz, so you may like to pop down & say G’day at Oceania - OpenStreetMap Community Forum
maxunladenweight:advisory= would be simpler and easier than vehicle:conditional=discouraged @ (unladenweight > 3.5) , especially considering how the conditions are quite undefined. motor_vehicle:advisory=destination has already been used in Australia somehow, which may be awkward with eg motor_vehicle=discouraged + motor_vehicle:conditional=yes @ (destination) instead, and the legal power is unclear.
