1. Nicholas J. Phillip R (2010) Development of safety performance functions for two-lane roads maintained by the Virginia Department of Transportation
2. Aram A (2010) Effective safety factors on horizontal curves of two-lane highways. J Appl Sci (Faisalabad) 10(22):2814–2822
3. Glennon JC (1987) Effect of alignment on highway safety, state of the art report. Transportation Research Board, National Research Council, Washington, DC
4. Srinivasan S (1982) Effect of roadway elements and environment on road safety. Institution of Engineers, p 63
5. Voigt AP, Krammes RA (1996) An operational and safety evaluation of alternative horizontal curve design approaches on rural two-lane highways. Texas Transportation Institute Research Report 04690-3, Texas A and M University, College Station