Wan, Hongliang, Zhigang Du, Qixiang Yan, and Xiaohong Chen. “Evaluating the Effectiveness of Speed Reduction Markings in Highway Tunnels”. Transport 33, no. 3 (July 10, 2018): 647-656. Accessed February 23, 2025. https://btp.vilniustech.lt/index.php/Transport/article/view/1574.