1. Carter E. C. and Homburger W. S. (1978). Introduction to transportation engineering . Reston Publishing Co. Reston Va.
2. Sight distance relationships for symmetrical sag curves with noncentered overpasses
3. Hickerson T. F. (1964). Route location and design . McGraw‐Hill Book Co. Inc. New York N.Y.
4. Khisty C. J. (1990). Transportation engineering: An introduction . Prentice Hall Englewood Cliffs N.J.
5. Neuman T. R. Glennon J. C. and Leisch J. E. (1982). “Stopping sight distance—an operational and cost effectiveness analysis.” Report FHWA/RD‐83/067 Federal Highway Administration (FHWA) U.S. Department of Transportation Washington D.C.