Qadr, D., Mohammed, S., Hasan, I. and Mohammed Ali, R. (2019) “Improving the Level of Service of a Portion of 60-M Ring-Road in Erbil City”, Cihan University-Erbil Scientific Journal, 3(1), pp. 12-17. doi: 10.24086/cuesj.v3n1y2019.pp12-17.