[Stocker]

Not just snow at higher altitudes.... it depends on conditions. I have seen chain requirements at fairly low elevations.

R1 -- Chains required, but snow tires allowed. Carry chains.

R2 -- Chains are required on all vehicles except four wheel drive vehicles with snow tires on all four wheels. (One reason I own a 4x4 with snow tires).

R3 -- Chains are required – all vehicles – no exceptions.

Next step up is closing the road. We have one section of highway that is often closed due to snow.