References
- Federal Highway Administration . 1974 . Nationwide Personal Transportation Study 1974: Purposes of Vehicle Trips and Travel , US Department of Transportation . Report No. 10, Figure 1
- Federal Highway Administration . 1975 . Fatal and Injury Accident Rates on Federal Aid and Other Highway Systems, 1975 , US Department of Transportation . Tables FT‐1, FTS‐1
- Johnson , P. , Klein , T. and Levy , P. 1978 . Effect of the 55 mph Speed Limit on Fatal Crashes in Texas , National Highway Traffic Safety Administration, US Department of Transportation .
- Klein , T. 1980 . The Effect of the 55 mph Speed Limit on Traffic Accidents in Illinois , National Highway Traffic Safety Administration, US Department of Transportation .