The Motor Vehicle Act of 1913 made driver's licenses mandatory for all motor vehicle operators in California as of December 31, 1913 (no citation or evidence for this statement).That law as well as the Vehicle Acts of 1915 and 1923 were codified into the first version of the Vehicle Code in 1935.
The requirement for driver's licenses among motor vehicle operators in California was established by the Motor Vehicle Act of 1913, which took effect on December 31, 1913 (no citation or evidence). This regulation and other Vehicle Acts from 1915 and 1923 were eventually integrated into the first version of the Vehicle Code in 1935.