We went down by Geneva and it wasn't bad at all. Only a tiny portion was in construction.

From the Spanish border to Barcelona, be careful on the road. Don't stop unless it's in a busy stop area.

There are groups of thieves who look for foreign plates and throws rocks at your car, when they come at your car level, they point at your tire frenetically to make you stop on the side of the road. They create diversion and steal your possessions and/or the car.

Keep driving no matter what and stop at a busing resting area.

We didn't see any on our trip but it happened to a friend of mine during Christmas.