We're thinking of driving to the South of France (possibly spending a few days in The Jura on the way) for our summer holiday. We have to go in school holidays and were thinking of going for the first two weeks in August to try and avoid the travel chaos from the major work that will be going on at London Waterloo in August. We've never driven to the South of France before, but I can vaguely remember someone saying that there was a 'Black Saturday' in France when the traffic is horrendous as everyone in France takes their annual holiday and drives south. Anyone know what dates are likely to be worse for traffic/driving?