Who warned you about fog?? Fog happens throughout winter.
Nobody can predict the weather. It could be foggy, icy, snowy, bright sunshine - all this can happen in December (and did do last year) and any month throughout Winter
I do numerous day trips skiing in Tirol and holidays west of Innsbruck (Ischgl) so I am travelling down the A8 Salzburger Autobahn then A93/A12 Inntal Autobahn frequently and driving up mountain valleys.
Less worry about fog - more worry about snow storms - you never know.
Thing is Munich - Innsbruck - Salzburg can all be done by direct trains between eachother - only Kitzbühel is off the main Intercity direct line.
You don't need a car in any of the cities unless you are interested in a day out somewhere.
All the major rental companies (Avis, Hertz, National, Sixt etc) fit Winter tyres as standard. Consolidators however do not (always) and this often has to be booked as an extra. Ensure you have them.
If picking up in Munich then you will require a Vignette to drive on the Austrian Autobahns. Cost €8 for 10 days and is availbalbe from Gas/Petrol stations/reststops all down the Germna Autobahns to the Austrian border and at the border Itself. If you decided totake the scenice drive from Munich to Innsbruck over Garmisch, Mittenwald and Seefeld then no Vignette required until you wish to use the Austrian Autobahns (e.g. A12 towards Wörgl for Kitzbühel) in this case you can buy the Vignette wherever (after you have entered Austria)
"Vignette" sign on the above Autobahn signs you will see at Petrol/gas stations
Usually the fog is more concentrated in the eastern or southern part of the country. Tyrol, to which Innsbruck and Kitzbühel belong, is not very often afected by fog. There are various types of fog. We here in Vienna have got every day fog, but it is a fog on higher altidues. You see everything. Consider that you can save a lot of money if you buy your ticket from Munich in advance. The so called Sparschieneticket from the website www.oebb.at/en
From Muncih to Salzburg you even pay only 22 Euros for the first traveller and 4 Euros for every other traveller to a maximum of four travellers with the Bayern Ticket. In that case you can only take german regional trains between both cities.
See more fog around large bodies of water and I think the Donau valley contributes to the fog.
See a lot more fog up towards Ingolstadt than for instance around Munich.
Can't say I've noticed that much around the Inn although fog just south of Munich shortly before Inntal dreieck early mornings not unusalEdited: 28 November 2012, 08:22
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