Good morning. Like many other U.S. states, California currently has no travel restrictions in place. That leaves a lot of travelers wondering about what precautions they should take after returning from a trip.

The question came to us from Abel Cruz, a reader in El Paso, who asked: If I drive to California from Texas, will I have to quarantine once I get there?

Mr. Cruz wants to visit family members in San Diego and the Victor Valley. I have been thinking of driving out to California but am not sure whether I should plan to quarantine once I get there, before I see family, he said.

[Track coronavirus cases by California county.]

While California does not have restrictions in place, Gov. Gavin Newsom urged people coming to the state to act responsibly. The key is when you do come into the state, that you abide by all the rules and regulations that our health officers have put forth, he said during a briefing on Monday.

The question of traveling across state lines during the pandemic can be tricky, since nearly half of the country currently has restrictions in place. Hawaii, for instance, requires visitors to quarantine for two weeks upon arrival, or risk being fined $5,000 or up to a year in prison.

[See which states currently have travel restrictions in place.]

For some additional guidance, I talked to Dr. Jeanne A. Noble, an emergency medicine doctor and the director of the Covid-19 response at U.C.S.F. Medical Centers emergency department, about how people can stay safe while traveling. Here are the takeaways from our conversation.

Arrange for testing ahead of time. Dr. Noble recommends getting a Covid-19 test a week before departing on a trip, to allow time for the results to come in. Be extra vigilant with your social distancing and face mask use during your pre-travel week so that you can remain confident that your negative test is meaningful, she said.

Since airline travel itself also puts you at risk for infection, you will need to quarantine and be retested once you have arrived at your destination, Dr. Noble said. Its best to wait at least four days after arriving in order to leave time for the virus, if present, to get to detectable levels.

If traveling by car, simply getting tested before you leave is probably adequate, but you should still quarantine if you have accidentally exposed yourself to potential risks.

When in doubt, quarantine. Although not required in California, its always safer to quarantine yourself if you cant get tested. This is to reduce the risk of spreading the virus to others. You can shorten your time in isolation, however, if you get a negative test.

And as always, if you begin to show flulike symptoms, assume that you are infected and seek repeat testing while you continue to self-isolate, Dr. Noble said.

[Could your symptoms be Covid-19?]

Wipe down high-touch surfaces. Traveling by car is generally safer because your car can be easily wiped down and sterilized. Dr. Noble recommends that people sanitize their hands and wipe down their steering wheel with disinfectants every time they get into the car.

Its best to travel with an ample supply of hand sanitizer and bleach or hydrogen peroxide wipes, Dr. Noble said.

If you have to stay overnight in a hotel, wipe down all high-touch surfaces, like doorknobs, faucets and phones, when you arrive.

Wear a mask and social distance. Face masks are one of the best protections we have against Covid-19, Dr. Noble said, so make sure you pack enough to last. Wear masks in public places, like hotel lobbies or food establishments. If you are in a setting where people are not wearing masks or practicing safe distancing, Dr. Noble recommends that you leave that place immediately.

Pay attention to local regulations. California residents visiting other states should check the specific restrictions at their destination before leaving. Pennsylvania, New York, New Jersey, Rhode Island and Connecticut require visitors from California to quarantine themselves for 14 days upon arrival.

Visitors to California should abide by Californias safe and responsible travel code and follow all public health rules, including a statewide mandate to wear a mask in public places.

Updated August 6, 2020

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They were fashioned from gauze and cheesecloth and became a symbol of the fight against an invisible enemy. Medical workers, police officers and everyday Americans wore them, but some resisted. This week, my colleague Christine Hauser wrote about how masks were politicized during the influenza pandemic of 1918. Four cities in California San Francisco, Oakland, Sacramento and Pasadena became some of the first in the country to put in effect mandatory face mask laws. Violators were sent to mask court, where they were subject to fines or 10 days imprisonment.

It is the most unpopular law ever placed on the Pasadena records, W.S. McIntyre, the chief of police, told The Los Angeles Times. We are cursed from all sides.

[Read the full article here.]

California Today goes live at 6:30 a.m. Pacific time weekdays. Tell us what you want to see: CAtoday@nytimes.com. Were you forwarded this email? Sign up for California Today here.

Jill Cowan grew up in Orange County, went to school at U.C. Berkeley and has reported all over the state, including the Bay Area, Bakersfield and Los Angeles but she always wants to see more. Follow along here or on Twitter, @jillcowan.

California Today is edited by Julie Bloom, who grew up in Los Angeles and graduated from U.C. Berkeley.

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California Doesn't Have Covid-19 Travel Restrictions. But Here's How to Protect Yourself - The New York Times