Automakers say the ratings are confusing and represent only one of many factors that lead to rollovers. But because most of the Firestone-related deaths were in rollover crashes of Ford Explorer SUVs, the industry is resigned to tougher scrutiny. The risk is actually the chance of rollover if a car or truck is involved in a single-vehicle crash. As recommended by the industry, the ratings will note which vehicles come equipped with stability systems, which help prevent rollover. Stability systems are an extension of antilock braking systems and traction control.
Sensors monitor the direction the driver wants to take a car and where it is actually heading.
Then the systems add brakes or power to send the car in the right direction. ABS Education Alliance says about 75 of the 2001 model-year vehicles have such systems. Continental Teves, which sells a system known as ESP to automakers, says information about stability systems makes the ratings more meaningful.