“Do Not Travel.” At Level 4, the top of the U.S. State Department’s scale, that is the whole message, and it carries a warning that “the U.S. government may have very limited ability to provide assistance,” according to Northwestern University’s travel-security guidance.
Governments issue these warnings to tell citizens how risky a foreign destination is before they book. The American version is the one most travellers know, and it sorts every country into one of four levels. Level 1 says “Exercise Normal Precautions.” Level 2 says “Exercise Increased Caution.” Level 3 says “Reconsider Travel.”
What the letters mean
From Level 2 up, each advisory states why. A letter code flags the main driver: C for crime, T for terrorism, U for civil unrest, N for natural disaster, H for health, K for kidnapping, D for wrongful detention, E for a time-limited event such as an election, and O for anything else. A Level 3 country marked H, for instance, may be dealing with a disease outbreak or a medical system in crisis.
InsideHook, in a February 27, 2026 piece, pointed out that the four levels are really closer to seven, because levels 1 to 3 can carry an extra security designation. Croatia gets striping that marks regions with higher risks, separate from petty crime.
Where the information comes from
The department draws on security experts, embassies and federal agencies such as the CDC, along with the Overseas Security Advisory Council, which collects reports from American businesses and NGOs. Dr. John Rose, chief risk advisor at Altour, told InsideHook: “The State Department has access to the best intelligence in the world. When they create a warning, is there a political tint to it? Absolutely.”
Embassies and consulates add their own layer. Alerts, sorted into Security, Health, Weather and Demonstration categories, have replaced the old Emergency and Security Messages and sit beneath the country advisory. The department revises advisories as conditions shift.
What a traveller can do with one
Carrie Pasquarello, a security expert quoted by InsideHook, suggests reading the advisories other governments publish, including those from Canada, the UK and Australia, and checking local crime data. Hotel security staff often know more than the front desk. She also points to travel insurance, which runs about 5% of trip costs, and to the Smart Traveler Enrollment Program, which takes roughly 20 minutes to join and sends safety updates.
Sources
- Evaluating State Department Advisories (Northwestern University, Global Safety and Security)
- The US State Department Doesn't Think Your Destination Is Safe: Should You Change Plans? (InsideHook)
