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3Key Fitzpatrick, Paul Carlson. Design Speed, Operating Speed, and Poseted Speed Practices. NCHRP Report 504. Transportation Research Board, 2003.
4Chris Lee, Bruce Hellinga, Frank Saceomanno. Evaluation of Variable Speed Limits to Improve Traffic Safety. Transportation Research Part C 14 (2006):213-228.
5Mohamed Abdel-Aty, j eremy Dilmore, Liang Hsia. Applying Variable Speed Limits and the Potential for Crash Migration. Transportation Research Record, No. 1953, Washington, D.C., 2006:21-30.
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7NHTSA. Traffic Safety Facts 1996. DOT- HS- 808- 649. U. S Department of Transportation, Dec. 1997.
