A peak of 216km of traffic jams across France was recorded at midday on Saturday, as motorists headed to the slopes.
The region with the most traffic jams was Auvergne-Rhône-Alpes, with 76km around noon.
The most congested road was the A43 motorway between Lyon and Chambéry, with more than 30km of traffic jams on this route alone. The Bison Futé traffic information service advised motorists to avoid this route until at least 5pm on Saturday.
The only region classified as "red" by the traffic information centre is Auvergne-Rhône-Alpes.
It is expected that traffic congestion will remain concentrated in France's Alpine region. In particular, local roads leading to ski resorts around Lyon and Grenoble are likely to be congested between 10am and 4pm on ski days.
The other major road facing severe traffic jams was the N85, which at midday had around 10km of traffic jams.
