T. Boonyoo, T. Champahom, K. Chanpariyavatevong, S. Jomnonkwao, P. Klungboonkrong, and V. Ratanavaraha, “Understanding relationship between road median type and accident frequency”, Eng Appl Sci Res, vol. 48, no. 4, pp. 466–475, Jun. 2021.