The shortest connection between Stuttgart and the lake of Come is via the Spluegen Pass (Via Spluga).
Do not try during the winter months as it will most probably closed because a lift is going across the street leading to the pass.
Take your time to see the magnificent landscape.
There are some rules to be watched - please do not enter on the tunnels when coming downhill before you are not 100% sure there no traffic coming in your direction. Some of the galleries do not have enough space to let two cars pass. The uphill traffic has the right of way. This may lead to the situation that you have to backup (if there is no car behind you) to give way to the car coming uphill. I have been blocked already for quite some time in such a situation - not amusing!
On the rout down to Chiavenna there are quite a few points to stop and ahem a look at the mountains and look.
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