I read from AA: and ... I am somewhat reluctanct to change tyres to drive on the motorway.. I don't think that their autobahn will have ice on the surface.. And when I say autobahn I mean 100% autobahn - no other roads I am going to use.. And what if it is a warm month? Like November or February? So my question.. How bad is this 'no-no' actually? Did anyone drive on summer tyres in winter? is it NO !! NO !! NO !! or is it just nah ? 'Practical' advice is welcome!