In New York, the city narrows down to a park. On top of the freeway onramp is one of those pink orbs.
Drive around behind there to find a small arena with a jump inside. Take the exterior road from there.
When you get to the speed you want to take the jump at turn around and take the jump. You have to be able to land on top.
We have more cheats and tips for this game here, Midnight Club: Street Racing cheats
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