Your Policy Comes With You. Mostly.

Take a California policy to Nevada, Oregon, Arizona or anywhere else in the United States and it travels with you. That is the short answer and it is broadly true. The caveats are few but worth knowing, because the ones that bite tend to bite at the worst moment.

The general rule

A standard personal auto policy provides coverage throughout the United States and its territories, and generally in Canada. Your liability limits, your comprehensive and collision, and your uninsured motorist coverage all come along. You do not need to buy anything extra to cross a state line.

Caveat one: other states' minimums

States set their own minimum liability requirements, and some are higher than California's 30/60/15 in one component or another. Most policies contain language that adjusts your limits upward to meet the requirements of a state you are driving in — but that is contract language, not California law, so it is worth confirming with your insurer rather than assuming. It is also an argument for not driving on minimum limits generally.

Caveat two: Mexico

This is the big one and it is unambiguous. A United States auto policy is generally not accepted as satisfying Mexican requirements, and Mexican law treats an uninsured driver in an accident very differently from what Californians expect. Separate Mexican liability coverage is bought for the trip. Do not drive south of the border assuming your policy follows you.

Caveat three: a long absence

A road trip is one thing; relocating a vehicle to another state for months is another. Where a vehicle is principally garaged is a rating and eligibility matter, and a car that has effectively moved needs a conversation with your insurer. This comes up with students, seasonal work and extended family stays.

The practical trip list

• Insurance card accessible on the phone and on paper.
• Roadside coverage confirmed — and check what its towing distance limit actually is.
• Your insurer's claims number saved in your contacts, not just on a card in a bag.
• If a rental is part of the trip, sort out the rental question before the counter, not at it.

If something happens away from home

Report it to your own insurer promptly regardless of which state you are in. Local reporting requirements vary, so ask the responding officer what is required there. And remember California's own rule when you come home: Vehicle Code section 16000 requires the driver to report to the DMV within 10 days when an accident caused injury, death, or over $1,000 damage to any one person's property.

Planning a long trip? A two-minute check of your limits and roadside coverage beforehand is worth more than any advice on this page.