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2. Albin, R., et al. 2016. Low-Cost Treatments for Horizontal Curve Safety 2016. Washington, D.C.
3. Automatic Horizontal Curve Identification for Large Areas from Geographic Information System Roadway Centerlines
4. Donnell, E., V. Gayah, J. Paul, and T. D. Larson. 2014. Safety Performance Functions.
5. FHWA. 2015. “Highway Statistics 2015.” Highw. Stat. 2015. https://www.fhwa.dot.gov/policyinformation/statistics/2015/.