They are all generally between Lyon and Aix, but last year we did some on the south coast as well. All over the south of france is good for tracks, as they all seem to be fenced in, floodlit and well maintained. The ones in the north are more "english" apparently!

There is a list of tracks/photos/info here:
http://www.bmx-race.net/pistes.php3Or here you can search by area I think:
http://www.ffc.fr/a_BMX/ClubPistes/index.aspThe tracks on the video are Dardilly, Chabeuil, Mours, Cornillon, Montelimar, Pernes les Fontaines & Les Pennes Mirabeau. Though we visited about 20 in total that week!