Better do not drive a highway
If you want to see anything do NOT drive the highway - btw you will miss Tarvisio when you do it.
The alternative national road is free, broad and very good and first of all very scenic with many tunnels, bridges and so on.
Highways in Northern Italy are toll and very comfortable. Probably they are most expensive and maybe the best - I mean in Northern Italy - in Europe.
It is NOT warm/hot Italy
Driving north from warm or hot Italian coasts be prepared to change climate hehe.
Once I was driving from Rome (sunny weather with +25C = 77F) and there was foggy weather with only +5C (= 41F) in Tarvisio the same day (in late evening in September) - rather no T-shirts and shorts hehe.
Fast changing clothes recommended before leaving a car hehe.
Buy some good snowtires !!
Maybe you don't expect it...but in the night can be a heavy snowfall....and you don't find your car anymore ! ;-)
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