Traffic fatalities fall to lowest level since 1949

"I think I'm going to take a little bit of credit here on our two years of really hammering on distracted driving," said Transportation Secretary Ray LaHood. "We're not where we want to be, but we know with good laws and good enforcement, people will put their cell phones down and their Blackberries."

He also gave credit to stricter enforcement of driving laws and drivers taking personal responsibility for their safety.

Traffic fatalities in the United States peaked in 1972, with 54,589 killed, according to the DOT. But the rise and decline of the grim number has numerous peaks and dips, influenced by direct changes such as the national speed limit and indirect causes such as recessions.

In recent history, the most notable change was a 9.7 percent plummet in deaths in 2008. In a report examining that drop, DOT officials gave credit to DOT safety programs, but also noted that the drop coincided with a recession in the economy. The recession, and high unemployment rates among the young workforce, probably had a big impact on travel among young drivers, and it probably accounts for a steep decline in fatalities involving younger people, the DOT said.

The 2010 drop is notable because the decline comes despite an increase in the number of miles driven.

But figures also suggest the downward trend may be at its end. DOT figures show that fatalities declined in the first quarter of the year (down 11.4 percent) and second quarter (down 5 percent) compared for the same quarters the previous year, but increased in the third and fourth quarters, up 1.6 percent and 1.8 percent respectively.