[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 HAM'S STATION TO SILVER LAKE (AMADOR CO) 1-WAY CONTROLLED TRAFFIC AT VARIOUS LOCATIONS FROM THE SAN JOAQUIN/AMADOR CO LINE TO 3.5 MI EAST OF THE SAN JOAQUIN/AMADOR CO LINE /AT JACKSON VALLEY RD/ FROM 1900 HRS EACH NIGHT TO 0700 HRS EACH MORNING MONDAY THRU THURSDAY THRU 4/9/15 - DUE TO MAINTENANCE - MOTORISTS ARE SUBJECT TO DELAYS OF UP TO 10 MINUTES