What is the correct way to drive on a road with the following traffic safety sign?

Answer: ② On a snowy road, avoid stopping partway up if possible.

This sign warns of an uphill slope (10% here). On a snowy uphill road, stopping halfway can make it hard to start again because the wheels spin, so try to keep moving steadily. Uphill you need a lower gear, not a higher one, and you should keep extra distance from heavily loaded vehicles, which may roll back. [Enforcement Rules of the Road Traffic Act, Annex 6, No. 116]