[IN THE CENTRAL CALIFORNIA & SIERRA NEVADA] CHAINS ARE REQUIRED ON ALL VEHICLES EXCEPT 4-WHEEL-DRIVE VEHICLES WITH SNOW TIRES ON ALL 4 WHEELS FROM 4 MI EAST OF HAM'S STATION (AMADOR CO) TO 1 MI WEST OF PICKETTS JCT (ALPINE CO) 1-WAY CONTROLLED TRAFFIC AT VARIOUS LOCATIONS FROM 1.2 MI EAST TO 1.5 MI EAST OF THE AMADOE/ALPINE CO LINE FROM 0900 HRS TO 1530 HRS TUESDAY THRU WEDNESDAY THRU 2/20/13 - DUE TO MAINTENANCE