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Driving around, we also found a couple of the 50 stunt jumps that will be featured in the final game. If you get a good run up in a fast car, you can nail massive jumps off of these ramps and clear rivers or barren land in a single bound. The upside of the stunt jumps is that you get recognition (and likely achievement points) for completing them, and you can control the camera to speed up or slow down the action during the jump. The downside is that if you crash into something when you hit the ground, you'll go hurtling through the windscreen.

Taken from gamespot :/