55 mph fact book. - United States. National Highway Traffic Safety Administration. Enforcement and Emergency Services Division ([Washington] : U.S. Dept. of Transportation, National Highway Traffic Safety Administration, Office of Driver and Pedestrian Programs, Enforcement and Emergency Services Division, 1978)
"DOT HS 803 577."
Keywords: Speed limits -- United States; Automobiles -- Fuel consumption -- Statistics; Traffic accidents -- United States -- Statistics