California - Provisional Drivers License Restrictions during the First Year Effective January 1, 2006, a new law will increase driving restrictions for persons under the age of 18 who: • Are issued a provisional driver license (DL) on or after January 1, 2006, or • Already hold a provisional DL issued on or after January 1, 2005. California Drivers License Restrictions. This particularly concerns drivers under the age of 18 who must observe all California provisional driver's license restrictions for at least 12 months or until they reach the age of 18, whatever comes first. California Drivers License Restriction Codes.