Possible Clues:

• Motor-sports zigzag bend
• Sharp double bend on a racetrack
• Trick? This bridge hand might not make one
• Series of bends on a motor racing circuit
• Sharp double bend as obstacle
• Double bend obstacle on racing track
• Series of sharp narrow bends (in motor racing)
• Short sequence of sharp bends in motor racing
• Accountant in China developing the bends
• Car-racing track obstacle