Hi David - if you're looking at a map, the E15 (or A1) is the autoroute which comes down towards Paris from Calais. At the Senlis junction we take the N330 towards and around Ermenonville - to the East of the autoroute. We then come back towards Paris on the N2, and just beyond Charles de Gaulle airport on the N2 take the junction with what (on our map) is listed as the E104, or A104 or the Francilienne. Follow this down, heading all the time for Marne la Vallee, then a sort of sharp turn and then another down towards Brie Comte Robert, and a series of junctions and bends until you end up at Evry, then down the E15, A6 for a bit until the junction for Nemours, then off on to the N7. It sounds much more complicated on the map, but actually isn't. Half way around it starts being signposted for Lyon and Bordeaux and you just follow those signs. There's only one place where you need to be in the correct lane - and I've marked it on another map. It's like a sort of glorified M25, without the traffic, and skirts you well away from Paris - nothing like the peripherique!! Hope this helps - get back if you need more information.