1. American Association of State Highway and Transportation Officials (AASHTO), 2011. A Policy on Geometric Design of Highways and Streets, 6th ed., Washington, DC.
2. Trees and highway safety, preliminary investigation Caltrans Division of Research and Innovation, (accessed July 28.07.12);Brown,2010
3. Trees and roadside safety in U.S. urban settings;Bratton,2005
4. Florida Median Handbook–Interim Handbook, (accessed 4.03.13);Florida Department of Transportation (FDOT),2008