Besides looking very cool, the serpentine maneuver is a great way to create very tight turns, with the added benefit of preventing off courses. Take a look at the sequence below:
Without the serpentine, most dogs will head toward the tunnel after jump #2. Even if the dog doesn’t actually take the tunnel, a wide turn after jump #2 will create a bad approach to jump #3 and some dogs may even turn toward the off course dummy jump instead of turning toward the tunnel after jump #3. The serpentine kills two birds with one stone, tightening your turn at jump #2 and eliminating the tunnel trap.