This article is from the California Driving (and Surviving) FAQ, by "George J Wu" georgewu@netcom.com with numerous contributions by others.
The grace period for a driver's licenses is 10 days unless you are employed
for the purpose of driving, in which case there is no grace period [CVC
12505]. Application for vehicle registration is required within 20 days
[CVC 4152.5].
 
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