References

• National Highway Traffic Safety Administration (2000b). Motor Vehicle Occupant Safety Survey 1998; Data Preview I-VII: Seat Belts. Office of Research and Traffic Records, National Highway Traffic Safety Administration. 
• National Highway Traffic Safety Administration (2000a). keywords: national occupant protection use survey. National Highway Traffic Safety Administration: www.nhtsa.dot.gov. 
• National Highway Traffic Safety Administration (1998). Observed Safety Belt Use 1990-1997, Traffic Safety Programs, National Highway Traffic Safety Administration. 
• National Highway Traffic Safety Administration (1999). Observed Safety Belt Use 1998, Traffic Safety Programs, National Highway Traffic Safety Administration. 
• Preusser, D.F. and Preusser, C.W. (1997). Evaluation of Louisiana's Safety Belt Law Change to Primary Enforcement. Final Report to the National Highway Traffic Safety Administration, Washington, DC, September 1997, available NTIS Springfield, VA, report number DOT HS 808 620. 
• Solomon, M.G. and Nissen, W.J. (2001). Evaluation of Maryland, Oklahoma and the District of Columbia's Seat Belt Law Change to Primary Enforcement. Final Report to the National Highway Traffic Safety Administration, Washington, DC, March 2001, available NTIS Springfield, VA, report number DOT HS 809 213. 
• Traffic Safety Facts 1996: Occupant Protection. National Center for Statistics & Analysis, National Highway Traffic Safety Administration, 1997. 
• Traffic Safety Facts 1997: Occupant Protection. National Center for Statistics & Analysis, National Highway Traffic Safety Administration, 1998. 
• Traffic Safety Facts 1998: Occupant Protection. National Center for Statistics & Analysis, National Highway Traffic Safety Administration, 1999. 
• Traffic Safety Facts 1999: Occupant Protection. National Center for Statistics & Analysis, National Highway Traffic Safety Administration, 2000. 
• Ulmer, R. G., Preusser, C. W., Preusser, D. F., Cosgrove, L. A. (1995). Evaluation of California's safety belt law change from secondary to primary enforcement. Journal of Safety Research, 26, 213-220. 
• Ulmer, R.G., Preusser, C.W., Preusser, D.F. (in process) Evaluation of Georgia's Safety Belt Law Change to Primary Enforcement. Final Report to the National Highway Traffic Safety Administration.

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