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As for the act of driving itself, it's been confirmed that the game will be completely free-roaming with a mission-based structure and a series of new challenges that aren't necessarily tied to traditional racing. Additionally, players can look forward to experiencing cop chase, cross-traffic, and gridlock situations, while old-school gameplay elements like jumps and extreme shortcuts make their return as well
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Those old school elements were Rush defined. Hopefully they aren't just pushed aside for the occasional shortcut with this new mission based free roaming thing. L.A. isn't nearly as hilly as San Fransisco and doesn't open itself to obvious hangtime in the old games. With destructible environments they will probably have you bursting through buildings or jumping off ramps created by broken areas to create these jumps. If it's designed well, owned.