One of the online tournaments is Long Jump, I was wondering which tracks are good for jumping long distances, as any good ramps I find always reset the the car immediately back on the track.
In the Codemasters Forum, it says: "Certain Mountains, I believe the ridges in some area's of Malaysia can launch you MILES allowing you to get ridiculously high and long jumps."
This video are in the Ladang Long - Malaysia
More youtube videos are made and can help you to find the track you want.
Edit: Others say that in L.A. you'll find a good track for long jump.
I think you can find on a big amount of tracks a place to get a long or high jump.