On our sister site a user recently used the term "tags" in relation to taxis in China.

I thought it might mean some kind of official authorization to operate a taxi.

But upon clarification I was told "tags" actually means "License plates and stickers that show the registration is currently valid".

I'm a native speaker of Australian English and I've travelled in almost every English speaking country and didn't know this use of "tags", though I guess this is not a topic that's come up in conversation in my travels often either.

In which countries would this sense be known?

* Just USA?
* USA and it's neighbours in Canada and Belize?
* All English speaking countries other than Australia?
* Even in Australia and I somehow remained ignorant of it despite having classic cars as a hobby for a number of years?