Four of us will be traveling through Switzerland for 5 days after disembarking from a Viking Cruise in Basel.
1) Will we need an IDP (international driving permit) while driving in Switzerland?
2) On our 4th day, we will be driving from Interlaken to Innertkirchen, then through the Susten Pass to Wassen before continuing on to Lucerne. My question: is the Susten Pass open and drivable in early September?
Thanks in advance to all the Rick Steve fans out there.