1. Highway Safety Manual;AASHTO (American Association of State Highway Transportation Officials),2010
2. A Policy on Geometric Design of Highways and Streets;AASHTO,2011
3. Development of highway alignment information from photolog data;Berg;Transportation Research Record,1989
4. Lateral clearance to vision obstacles on horizontal curves;Easa;Transportation Research Record,1991
5. Lateral clearance needs on compound horizontal curves;Easa;Journal of Transportation Engineering,1993