Critical headway and follow-up time analysis at two-lane roundabouts Navruz Mirzorahimovich Karimov, Jahongir Tilloevich Pirov and Alexander Yuryevich Mikhaylov E3S Web Conf., 403 (2023) 07015 Published online: 25 July 2023 DOI: 10.1051/e3sconf/202340307015