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The poll of 600 Nevada voters July 30 to Aug. 1 also found that 74 percent believe the economy is the state’s biggest problem, and 63 percent favor an immigration law like Arizona’s that would enable police to check the status of people they stop.

NHTSA

New technology can prevent rollovers

Stability-control systems already on the market for tractor-trailer trucks, including tank trucks hauling hazardous loads, could prevent nearly 3,500 rollover accidents and save an estimated 106 lives a year if they were required on trucks, a federal safety official said Tuesday.

Nathaniel Beuse, director of crash-avoidance standards at the National Highway Traffic Safety Administration, said his estimate was based on tests of the stability systems the agency conducted with researchers from the University of Michigan. The study found that almost 4,400 injuries a year could be prevented with the systems.

All new passenger vehicles are required to have stability-control systems, but not commercial trucks, even though trucks represent a disproportionate share of rollover accidents.

NHTSA hopes to complete studies on the potential benefits of requiring the systems for tractor-trailer trucks before the end of the year, Mr. Beuse told a hearing of the National Transportation Safety Board.