Drivers should exercise extra caution this week as the first significant rainfall of the season passes through. It will cause extra slippery roadways, the National Weather Service said.
Rain began passing through northern California Monday, and is expected to last all week.
The Bay Area Naiontal Weather Service warned of dangerous driving conditions in a "Hazardous Weather Outlook":
"MOTORISTS ARE URGED TO USE CAUTION AS THIS FIRST SIGNIFICANT RAIN OF SEASON FOR MUCH OF THE AREA WILL RESULT IN LEACHING OUT OF LONG-ACCUMULATED OILS IN THE PAVEMENT...AND THUS VERY SLIPPERY ROADWAYS."
Sacramento area police departments are asking drivers to use caution as well.
"If you are planning a trip, remember to check the air in your tires and to check your windshield wipers," said the Elk Grove Police Department on their Facebook page. "The roadways will be slippery, so slow down, turn on your headlights and maintain a proper following distance (3 second rule)."