1. Benekohal R. F. and Hashmi A. M. (1990). “Accident savings from roadside improvements on two‐lane rural highways.” Report No. FHWA/IL/RC‐009 Federal Highway Administration Washington D.C.
2. Comparison of safety effects of roadside vs road improvements on two‐lane rural highways;Benekohal R. F.;Transportation Research Record,1991
3. Box G. E. P. Hunter W. G. and Hunter J. S. (1978). Statistics for experimenters . Wiley & Son New York N.Y.
4. Boyce D. E. Hochmuth J. J. Meneguzzer C. and Mortimer R. G. (1988). Cost‐effective 3R roadside safety policy for two‐lane rural highways . Illinois Department of Transportation Springfield Ill.
5. Macroscopic modeling of two‐lane rural roadside accidents;Cleveland D. E.;Transp. Res. Record,1978