R-1: Chains are required on all vehicles under 6,000 pounds except those equipped with snow tires on the drive wheels. All vehicles over 6,000 pounds are required to place chains on the drive wheels.
R-2: Chains are required on all vehicles except four-wheel drives equipped with snow tires on all four wheels.
R-3: Chains are required on all vehicles without exception. Please be aware that these designations are for the safety of all and are enforced by public safety officers including our local Mammoth Lakes Police Department, Mono County Sheriff and the Highway Patrol.
The penalty for failure to observe the posted chain controls may include a citation and a severe fine. Remember to always carry chains and use them when required to do so.