G. Sofia G, H. Al-Haddad A, Saeed Al-Haydari I. Development of Delay Models for Roundabouts. J. eng. sustain. dev. 2012;16(1):75-91. Accessed June 4, 2026. https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/1163