Preventing black ice on winter roads using underground heat stocking 0 17 2023.12.19 15:29 https://youtu.be/ZD2moPo_Rik + 2 도로의 암살자 '블랙 아이스' 여름철 모은 땅속 열로 막는다 As the weather is getting colder, we need to look out for black ice.