1. Highway Safety Manual;American Association of State Highway and Transportation Officials (AASHTO),2010
2. Highway Safety Manual Supplement, Chapter 18;American Association of State Highway and Transportation Officials (AASHTO),2014
3. ASAP project – Appropriate Speed saves All People. , last accessed 17 December 2015.
4. Bonneson, J.A., Geedipally, S., Pratt, M.P., Lord, D., 2012. Safety Prediction Methodology and Analysis Tool for Freeways and Interchanges. NCHRP Project 17–45, Final Report.
5. Facts and Statistics – FHWA Work Zone. Work Zone Injuries and Fatalities. (Accessed 5 February 2016).