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 December 19, 2024. https://jau.vgtu.lt/index.php/Transport/article/view/1574.