Hey ho,
traffic in the mountains - i don't know
french gendarme - i don't know
Z4M is filled up - check
girlfriend is on passenger seat - check
amex - check
I think we have only one problem - the Tour The France. This Event is during the second week in this area. I would change the route spontaneously.
We will not reserve the hotels. It's a classic roadtrip like my first trips.
Drive and drive and on a nice place we will eat and sleep.
With a large group that is nearly impossible.