935.134—Arm signals.
(a)
Any person operating a motor vehicle and making a turn or coming to a stop shall signal the turn or stop in accordance with this section.
(b)
A signal for a turn or stop is made by fully extending the left arm as follows:
(1)
Left turn—extend left arm horizontally.
(2)
Right turn—extend left arm upward.
(3)
Stop or decrease speed—extend left arm downward.
(c)
A signal light or other device may be used in place of an arm signal prescribed in paragraph (b) of this section if it is visible and intelligible.