Almost 6 out of 7 U.S. drivers surveyed report that they always wear a seat belt when driving or riding in a motor vehicle, according to a study just released by the Centers for Disease Control and Prevention (CDC). Seat belt use has become the national norm in most states, though rates of self-reported seat belt use vary widely from state to state, with a high of 94 percent (Oregon) and a low of 59 percent (North Dakota).

Still, every 14 seconds, an adult in the United States is treated in an emergency department for crash-related injuries.

"A simple step that most drivers and passengers in the United States already take—buckling their seat belts—cuts in half the chance of being seriously injured or killed in a crash," said CDC Director Thomas R. Frieden, MD, MPH. "Yet, about 1 in 7 adults do not wear a seat belt on every trip. If everyone in the vehicle buckled up every time, we could further reduce one of the leading causes of death."

The study appeared in Vital Signs, a section of CDC's Morbidity and Mortality Weekly Report (MMWR). The study found that states with primary seat belt enforcement laws, where police officers can pull cars over and issue tickets solely because drivers and passengers are unbelted, have higher rates of seat belt use than states with secondary enforcement laws, which only allow officers to issue tickets to drivers who have been pulled over for violating another law. States with primary enforcement laws had an overall seat belt use rate of 88 percent, whereas states with secondary enforcement laws had an overall seat belt use rate of 79 percent. The national average for seat belt use is 85 percent.

Though 1 in 3 U.S. adults lived in states with secondary enforcement laws in 2008, residents of these states accounted for 49 percent of the unbelted drivers and passengers on U.S. roads. Nineteen states do not have primary enforcement seat belt laws.

"As seatbelt use increases and more states pass primary enforcement laws, we are seeing crash-related injuries decline," said Linda Degutis, Dr. PH, MSN, director of CDC's Injury Center. "This indicates that primary enforcement laws, paired with vigorous enforcement programs, get more people to wear seat belts. We know that buckling up can make a life-saving difference."

For the study, CDC researchers analyzed two national sources: 2009 National Electronic Injury Surveillance System-All Injury Program data on non-fatal injuries treated in emergency departments nationwide and 2008 Behavioral Risk Factor Surveillance System data on self-reported risk behaviors. To help increase seat belt use and protect more people on the road, CDC supports primary enforcement seat belt laws that cover all drivers and passengers of appropriate age and size, regardless of whether they are sitting in the front or back seat of the vehicle.

According to previous research by CDC and others, everyone is encouraged to take the following steps:

• Use a seat belt on every trip, no matter how short.
• Encourage everyone in the car to buckle up, including those in the back seat.
• Make sure children are properly buckled up in a seat belt, booster seat, or car seat, whichever is age- and size-appropriate.
• Have all children ages 12 and under sit in the back seat.

CDC is also releasing "Policy Impact: Seat Belts," one in a series of briefs highlighting key public health issues, and important science-based policy actions that can be taken to address them. Through this new publication, available at: www.cdc.gov/motorvehiclesafety/seatbeltbrief, CDC supports state-based efforts to strengthen seat belt policies and prevent crash-related injuries and deaths. CDC's Injury Center works to protect the safety of everyone on the roads, every day. For more information about seat belts and motor vehicle safety, please visit www.cdc.gov/motorvehiclesafety. and www.cdc.gov/vitalsigns.