En español | Another terror attack occurred in London over the weekend just as the high season for European travel gets underway. 

Britain is a huge draw for American travelers: 3.46 million visitors arrived from the U.S. last year (up nearly 6 percent over 2015), and the British Tourism Alliance expects that number to grow by 10 percent in 2017 — due at least in part to the weak post-Brexit pound. 

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The British government considers the current terrorism threat level in Britain severe, indicating that an attack is highly likely; it was at that level at the time of the London Bridge rampage on Saturday that left at least seven dead. The U.S. State Department has yet to caution against travel to Britain or London in particular, though last month it issued an alert for Americans to be vigilant when visiting throughout Europe. 

Experts say travelers shouldn't let fear cloud rational thinking. "You're more likely to be struck by lightning standing in line at the Louvre than you are to be killed by terrorists," Bruce McIndoe, CEO of the risk management firm iJet International, told AARP. "The perception is much worse than the reality."

Here are tips on how to travel safely and confidently when leaving the country.

Seek out the best information

Consult U.S. Department of State advisories before you book. There are two types of notices.

  • Travel warnings are issued in the event of extreme civil unrest, terrorist activity, and other dangerous conditions. The State Department recommends postponing travel.
  • Travel alerts address more short-term situations that could pose a risk or disrupt travel plans. They're meant to quickly disseminate news about unrest, crime, health and weather events.

Check health advisories to determine if immunizations or prophylactic medications are necessary. 

For a broader take, look at other governments' advisories. Great Britain's 

(gov.uk/foreign-travel-advice) and Australia's (smartraveller.gov.au) sites offer up-to-date travel info for numerous countries around the globe.

Make your plans known

You should be sure that you have a way to get in contact with U.S. embassies abroad.

Sign up for the Smart Traveler Enrollment Program. Go to step.state.gov and follow the instructions. Once you've signed up, any local U.S. embassy or consulate can contact you in the event of an emergency.

  • Carry contact information for all those local offices (travel.state.gov). They maintain 24/7 emergency hotlines.
  • Another handy contact: The Office of Overseas Citizens Services (888-407-4747 toll-free) can relay urgent messages from family members.

Consider buying travel insurance

Most comprehensive policies will reimburse you for nonrefundable travel expenses if you cancel or postpone a trip after a terrorist incident at a destination on your itinerary. But read the fine print first: How policies define a terrorist act may differ.

  • Time frames vary, but typically, the act would have to have occurred within seven to 30 days of your scheduled arrival.
  • If you're truly risk averse, consider a cancel-for-any-reason policy. They typically allow cancellation up to two days before departure and cover 75 percent of prepaid or nonrefundable expenses. The downside: They're costly.

Most travel insurance policies include some travel assistance, such as a 24/7 hotline for rebooking and help with arranging an evacuation.

Two good sources of information: the U.S. Travel Insurance Association (ustia.org) and the aggregator site InsureMyTrip.com.