Highway deaths declined again last year, reaching their lowest rate when compared to miles driven since such record-keeping began in 1921. The National Highway Traffic Safety Administration's early estimate of 2011 traffic fatalities ... said there were 32,310 deaths in motor vehicle crashes last year, a drop of 1.7 percent from the previous year. That's the lowest number of deaths in more than 60 years. Safety experts have attributed the historic decline to a variety of factors, including less driving due to a weak economy, more people wearing seat belts, better safety equipment in cars and efforts to curb drunken driving. The number of miles driven on America's roadways declined last year by 35.7 billion miles, or 1.2 percent, the safety administration said. There were 1.09 deaths per 100 million miles traveled, down slightly from 1.11 deaths in 2010. That's the lowest rate on record, NHTSA says. Overall, traffic fatalities have plummeted 26 percent since 2005. There were significant regional differences in the fatality reductions last year, with the sharpest drop -- 7.2 percent -- in the six New England states.