1. National Highway Traffic Safety Administration (2016) Motor vehicle traffic crashes as a leading cause of death in the United States, 2012–2014. U.S. Department of Transportation
2. Federal Highway Administration (2009) Highway safety improvement program manual, federal highway administration, Report No. FHWA-SA-09-029
3. Federal Highway Administration (2017) Roadway departure safety. Washington DC.
https://safety.fhwa.dot.gov/roadway_dept/
4. Wiebelhaus M, Lechtenberg K, Sicking D, Faller D, Rosenbaugh S (2013) Cost effective treatment of existing guardrail systems. MwRSF Research Report No. TRP03-254-13
5. Mehrara Molan A, Rezapour M, Ksaibati K (2019) Modeling the impact of various variables on severity of crashes involving traffic barriers. J Transp Saf Secur.
https://doi.org/10.1080/19439962.2018.1547995