Snowy roads, such as tunnel entrances, bridges, and curves, may be frozen even if they appear safe at first glance, making them extremely dangerous.
To prevent slip accidents,
・Do not turn the steering wheel suddenly
・Do not brake suddenly
・Do not make sudden starts
Avoid sudden driving such as the above, drive slowly, keep a long distance between vehicles, and be mindful of safe driving.
The actual dashcam footage can be seen here: (This video was created by the Hokkaido Prefectural Police.)
1. Winter Driving (Japanese version) (youtube.com)
2. Winter Driving (English Version) (youtube.com)