Cyber-attacks on the optimal velocity and its variation by bifurcation analyses Kun Zhang, Yu Xue, Hao-Jie Luo, Qiang Zhang, Yuan Tang and Bing-Ling Cen Eur. Phys. J. B, 96 12 (2023) 166 Published online: 20 December 2023 DOI: 10.1140/epjb/s10051-023-00641-9