Is Your SUV Safe?

March 12, 2008 — -- More than 10,000 people each year are killed in rollover accidents, but a new study shows there's a way automakers can reduce that death toll.

Roof strength is one of many factors that determine whether people inside a vehicle survive rollover accidents, according to a report published by the Insurance Institute for Highway Safety.

By testing the roofs of 11 sport utility vehicles, then looking at the deaths and injury rates in accidents, the institute found that the stronger the roof was, the less likelihood of injury or death.

"Roofs that crush too easily are allowing people to be injured and killed," said Adrian Lund, president of the institute. Lund said that stronger roofs would help offer better protection to both unbelted and belted passengers and drivers.

Rollovers account for about one-quarter of those who die in car crashes, but SUVs that are higher off the ground than other vehicles are particularly prone to rollovers. The study contends that stronger roofs, like the one on the 2000 Nissan Xterra, could cut injury risk by a third in single-vehicle SUV rollover crashes.

But not everyone agrees with the report's findings. The Alliance of Automobile Manufacturers called the institute's study "flawed analysis," contending that, "there remains no definitive answer as to what effect roof strength has on injury risk in rollover crashes."

Automakers have voluntarily implemented safety measures like electronic stability control and advanced safety belt systems to boost vehicle safety, and have also started developing sensors that will trigger side curtain air bags during a rollover.

"Automakers understand that the most effective strategy for reducing rollover fatalities and injuries is avoiding a crash in the first place," the alliance said in a statement.

The report comes as the National Highway Traffic Safety Administration updates its standard for passenger vehicles' minimum roof strength.

The current standard requires vehicles to withstand 1½ times the weight of the vehicle before crushing five inches. The administration would like to require passenger vehicles to withstand 2½ times its weight instead. The Insurance Institute for Highway Safety says that's still not good enough, and argues a passenger vehicle should be able to withstand three times its weight when it rolls over.