Instructions
Start the game and select the "World Tour Mode" from the main menu. You will be presented with a series of races and challenges. Complete these with a bronze medal or better to open up new challenges.
Select the "Crash Junction" challenges available during the "World Tour Mode." These are available in "America," "Europe" and the "Far East" and become available as you progress through the other challenges in the "World Tour Mode."
Get a gold medal in the "Crash Junction" during "World Tour Mode" and you will unlock it for the crash mode as well. To get gold, drive over all the "Cash Multiplier" icons (these have "x2" and "x4" written on them) to double or quadruple your final score. The aim is to destroy as much civilian traffic as possible and get points for it.