There are usually different levels of "chain requirement."
As I recall here in CA:
Chains R1: Required to have tyre chains available, four-wheel-drive vehicles with an aggressive tread tyre are exempt.
Chains R2: Require to have tyre chains mounted, four-wheel-drive vehicles iwth an aggressive tread tyre are required to have them available.
Chains R3: All vehicles required to have tyre chains mounted.
I just find it amusing that the last time I had to drive through an R2 in my 87 some years back, CHP asked to see my chains. So I held up my tow chain bag, and they passed me.
I drove up 80 dead straight at a solid 40mph in 4HI on four nearly-bald BFG A/Ts. I'm seeing idiots in FWD vehicles with tyre chains on the back, or 2WD pickups with tyre chains on the front - and they're sliding all over the place. Do they just not teach people how to drive out here?
Back home, when wintertime would hit, I'd throw a bag of rock salt and a bag of play sand in the well behind the backseat of my Bug. Things got bad, I'd open one or the other and use it to get out (we had a water softener - so rock salt - and my kid sister had a sandbox - so play sand.) I never even heard of chains until I came out to CA, then I wondered why you'd wrap your tyres in chains anyhow (seemed easier to me to just actually learn to drive properly in the snow...)