Try to avoid traveling on the road on rainy or snowy days, especially if you are going to / from the mountain areas. Most of these areas have not yet been fully developed and their very narrow, winding roads become especially dangerous when it’s raining or snowing.
In fact, there are many fatal car accidents every year due to the poor road condition in the mountain areas. And the local government is aware of this that it blocks the roads in the mountains whenever it rains/snows heavily. It will be so bad if you are in the middle of your 8-hour ride, only to learn that you can’t proceed any further but change your plan, or even worse, cancel your trip and head back to wherever you are from.