1. American Association of State Highway Transportation Officials, A Policy on Geometric Design of Highways and Streets, vol. 6th Edition, Washington, D.C., 2011.
2. American Association of State Highway Transportation Officials, 2011. Roadside Design Guide, vol. 4th ed, Washington, D.C.
3. Statistical Models of Accidents on Interchange Ramps and Speed-Change Lanes;Bauer,1998
4. California Department of Transportation, 2013. Freeway Exit Gore Signage: A Survey of State Practice and Related Research, CTC and Associates LLC.
5. Carlson, P.J., Pratt, M.P., Higgins, L.L., Nelson, A.A., 2014. Traffic control device evaluation program: technical report, Texas. Dept. of Transportation.