1. Takata, T., Tokunaga, R., Takahashi, N.: Type of winter traffic accidents on national roads in Hokkaido. In: The 53th Hokkaido Development Technology Research Conference, Civil Engineering Research Institute, February 2010
2. Police department in Hokkaido, The Actual State of Winter Typed Traffic Accidents, November 2018. https://www.police.pref.hokkaido.lg.jp/info/koutuu/fuyumichi/blizzard.pdf
3. Sato, G., Sakuraba, A., Arai, Y., Saito, Y., Hakura, J., Shibata, Y.: A new road state information platform based on crowed sensing on challenged network environment. Internet Things 18(6), 100214 (2020). https://doi.org/10.1016/j.iot.2020.100214
4. Sakuraba, A., Sato, G., Uchida, N., Shibata, Y.: Performance evaluation of 2-wavelength cognitive wireless network for V2X communication. Int. J. Mob. Comput. Multimedia Commun. (IJMCMC) 11(4), 84–102 (2020)
5. Takahashi, N., Tokunaga, R.A., Sato, T., Ishikawa, N.: Road surface temperature model accounting for the effects of surrounding environment. J. Japan. Soc. Snow Ice 72(6), 377–390 (2010)