§ 71.025 METHOD OF GIVING HAND AND ARM SIGNALS.
   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.
   (C)   Stop or decrease of speed. Hand and arm extended downward.
(ILCS Ch. 625, Act 5, § 11-806) Penalty, see § 71.999