Tire chains and cables are devices that improve traction in snow and ice. Chains provide better traction than cables, however cables are easier to install; both are acceptable under the law for most vehicles. Tire socks are also acceptable. Plastic devices, straps, and other emergency or alternative "tire chains" do not meet the legal requirement. 

Chains are often required on roads both inside and outside of Yosemite from November through March, less often in October and April, and rarely in September or May. Because high-elevation roads receive more snow, chains are required on the Wawona Road (Highway 41), Big Oak Flat Road (Highway 120 from the west), and Badger Pass Road more often than on the El Portal Road (Highway 140), roads within Yosemite Valley, and the Hetch Hetchy Road.




Where To Buy Snow Chains In San Francisco