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All signals given by hand and arm shall be given from the left side of the vehicle in the following manner, and the signals shall indicate as follows:
(A) Left turn - hand and arm extended horizontally.
(B) Right turn - hand and arm extended upward except that a person operating a bicycle may extend the right hand and arm horizontally and to the right side of the bicycle.
(C) Stop or decrease of speed - hand and arm extended downward.
(ILCS Ch. 625, Act 5, § 11-806) ('64 Code, § 21-65) Penalty, see § 70.999