According to DC Inside, the road from the Uiwang Tunnel to the Uiwang Toll Gate is downhill, and there are cars stranded on the icy road and people who have completely abandoned the road.
Occasionally, there are cars that pass through it, so they say that the cars that pass by from time to time are those cars.
The importance of winter tires
https://m.dcinside.com/board/transit/876100