At a time when gas prices are at an all-time high, Americans have curtailed their driving at a historic rate.
The Department of Transportation said figures from March show the steepest decrease in driving ever recorded.
Compared with March a year earlier, Americans drove an estimated 4.3 percent less -- that's 11 billion fewer miles, the DOT's Federal Highway Administration said Monday, calling it "the sharpest yearly drop for any month in FHWA history." Records have been kept since 1942.