When making the decision to follow a driving tour in a guide book, you may wish to closely examine the entire route. Not just the destinations on the route.
Or your driving tour may be abruptly ended by a huge sign informing you that the mountain pass is closed. Because, of course, it is winter time in the Alps.
Although we did go far enough along to get this fabulous view from the top of Merten:
We'll try to complete the driving tour in the Spring. After the snow has melted and the passes are once again open.