I thought 4x4 and AWD vehicles are exempt. Every time I came up to a chain checkpoint they let me through without them.
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I read it is route specific so.
Route specific
Chains are most often required in the higher mountain passes of northern California, such as: Interstate 5 north of Redding;
Interstate 80 over Donner Pass between Sacramento and Reno, NV; and
U.S. Highway 50 over Echo Summit between Lake Tahoe and Sacramento.
Chains are also sometimes required on:
State Route 58 near Tehachapi between Bakersfield and Mojave;
Interstate 15 over Cajon Pass between Victorville and San Bernardino; and Interstate 5 over Tejon Pass between Los Angeles and Bakersfield