1. Radar detectors and speeds in Maryland and Virginia;Ciccone;Journal of Police Science and Administration,1987
2. An evaluation of the halo effect in speed detection and enforcement;Dart,1976
3. Highway statistics, summary to 1985;Federal Highway Administration (FHWA),1985
4. Highway Statistics 1988;Federal Highway Administration (FHWA),1988
5. Speeds associated with 55 mph and 65 mph speed limits in northeastern states;Freedman;ITE Journal,1991