Hadji Hosseinlou, Mansour, Alireza Mahdavi, and Mojtaba Alinezhad. 2018. “Optimization of the Allowable Speed on Iran’s Freeways to Reduce Violations and Accidents, Using Zero-Truncated Poisson Regression Model”. Civil Engineering Journal 4 (2):443-49. https://doi.org/10.28991/cej-0309104.