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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.