Tour de France RV/Campervan parking policy Are there any rules regarding parking an RV/Campervan alongside the Tour de France course?  Can you just park anywhere that isn't yet closed off?  How long before the race comes by do you need to get there?  How soon after the race can you leave?  I'm asking specifically about stages in the French Alps.
My research suggests that there is no absolute answer to this.
According to Watching the Tour De France in person

If you're planning on camping out on top of the more popular mountains, try to arrive a good two days prior to the race coming through to get a prime parking and/or camping space.
Road closures
Once you have decided where you would like to see the Tour, check prior to arriving – or with the local tourist office as soon as you arrive – to see which roads are going to be closed (and when).

Spectating Tips For A Grand Tour says

The race website or local newspaper will have the schedule listing when the race will pass. However this is more for information because on a big mountain stage all the roads are blocked from the morning onwards. The roads close well in advance of the race. There’s no fixed time but on a big mountain stage you can expect the route to be closed at breakfast time to cars. It’s why many will drive up the day before and camp overnight, indeed even if you drive up a climb you’ll find many of the parking places are taken days before by camper vans.

Another site (can't find it right now) said that the Gendarmes can close roads or move you on as they see fit.
So, many people want to see it, and there are no guarantees.