M did great on the road...we departed at 10am and he was promptly asleep by 11am (and drowsy in between). He woke up just in time for our stop for lunch/gas and bathrooms. The French "Interstate" or Autoroute system are privately owned there for there are tolls and expensive ones for that matter (2.5 hours SW of Paris = just shy of 30 euros!). Therefore if you leave the interstate you pay...and most villages are not right next to an on ramp like in the States. So the picnic/gas stops are privately owned and expensive (for gas not sure about food as we just bought sandwiches).
After lunch we hopped back in the car and finished our 2.5 hours to our relatives house. M did wonderfully no car sickness or crying. We kept him occupied with a bunch of small toys (cars, small books, crayons, legos etc...much like the goodie bags I make for plane rides). Once arrived we spent the rest of the day sitting outside, taking photos of M and chatting.