From WikiGTA - The Complete Grand Theft Auto Walkthrough
> Grand Theft Auto: San Andreas
> Unique Stunt Jumps
GTA San Andreas contains 70 Unique Stunt Jumps spread over San Andreas. An Unique Stunt Jump is made by driving with a vehicle at high speed at certain places over a ramp. The view shifts to another camera position from where you'll have a good view at the jump, the jump will also be shown in slow-motion. When you land at the right place you'll get a confirmation that you made the jump correctly. For every Unique Stunt Jump you make you'll be rewarded with a bonus of $500.=. The Unique Stunt Jumps are, in contrast to other GTA's, not necessary in order to complete the game with 100% progress.
- The NRG-500 is due to it's fast acceleration an ideal vehicle to make all Unique Stunt Jumps. By giving Carl Johnson an aerodynamic position you gain a higher speed over a short distance. This position can be achieved on a PS2 by moving the left analog stick slightly forward, on a PC this is done by tapping the arrow-up button.
Descriptions with screenshots