@sandyf
Are you referring to the rule that applies to those who are 16-17 ? Individuals in this age group can only drive in another state for 10 or so days. They can get around this by applying for a Nonresident Minor's certificate at the DMV.
If you are 18 years or older and have an out-of-state driver's license, you can drive in that state for the duration of your visit. California cannot make or enforce laws for other states and vise-versa. States also have the 138-day or 366-day rule that determines if an individual 18 years or older is a resident or non-resident.
@sandyf wrote:
I am thinking some rules are made to be broken. I would include in this someone earning $15 on a infrequent mystery shop and having to fill out a second state income tax form. I also learned a few years ago that if you spent more than 15 days in another state California considers you a non resident as far as your car registration goes. So do not vacation anywhere else for over 2 weeks or you have to re register your car and get new license plates for the rest of your trip. I actually called and spoke to someone at the time as it sounded too ridiculous to me but they confirmed it was true.