What does this driver indicate by moving his arm alternately up and down with short, rapid movements?

Question

DentroTest · Accepted Answer

Any intention to bring the vehicle to a stop or to slow it down considerably must be warned of whenever possible. This warning is usually given by repeatedly using the brake lights. Failing this, or as a complement, it can be signaled by moving the arm alternately up and down with short, rapid movements. In this way, drivers behind are warned to avoid rear-end collisions.

What does this driver indicate by moving his arm alternately up and down with short, rapid movements?

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