Sec. 545.107.  METHOD OF GIVING HAND AND ARM SIGNALS.  An operator who is permitted to give a hand and arm signal shall give the signal from the left side of the vehicle as follows:
(1)  to make a left turn signal, extend hand and arm horizontally;
(2)  to make a right turn signal, extend hand and arm upward, except that a bicycle operator may signal from the right side of the vehicle with the hand and arm extended horizontally;  and
(3)  to stop or decrease speed, extend hand and arm downward.
Acts 1995, 74th Leg., ch. 165, Sec. 1, eff. Sept. 1, 1995.