Teams of racers test themselves by hurtling down challenging, obstacle-filled courses in homemade, motorless soapbox race cars.

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Teams of racers test themselves by hurtling down challenging, obstacle-filled courses in homemade, motorless soapbox race cars.

The normally tranquil streets of East Melbourne transform into a festival of gravity racing; 56 teams take on a ferocious course littered with obstacles.

Fearless Norwegian soapbox racers conquer Torshovdalen Park in Oslo; they try to master a treacherous water feature, a challenging berm, and a startlingly steep finish.