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Body Parts

My two arms keep a rhythmical pattern.
I move when necessary, but seldom when I am not needed.
Through downpours, I help prevent accidents because I let people see.
What am I?

Armless with six legs, i start out small,  but I can swarm a mountain.
Sometimes I become a man, but only for a short period of time.
What am i?

Two bodies joined in one.
The longer I stand still , the faster I run.
What am I?

See answer

Brain Teasers