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Hi.. not sure if its safe to drive in winter - December, from Austria - Slovenia ?? As I think duration is shorter by taking train and bus !!! As we are from Singapore, and not sure if its appropriate to drive..
To add to my other reply, driving in winter is less safe then driving in summer, obviously. Train or bus will be a longer transfer in time but much safer. If you are only looking for a long haul like Vienna to Ljubljana then you have several options, like plane, bus and train.
Motorways in Slovenia and Austria are well maintaned so i think it is safe. Obviously, as stated above, not so safe as in summer, but comparing to motorways in some other EU countries, driving in SLO in winter is safe.
If you haven’t drive in winter conditions with potential icy roads, snow and plenty of fog on passages from Austria to Slovenia, I recommend you to use Flix bus or Airline from Austria to Slovenia in winter. You might be fine with car but why risk and ruin the vacation.