RS 32:105: Signals by hand and arm or signal lamps

A. Any stop or turn signal when required herein shall be given either by means of the hand and arm as provided in R.S. 32:106 or by signal lamps, except as otherwise provided in Paragraph B.

B. Any motor vehicle in use on a highway shall be equipped with, and the required signal shall be given by, signal lamps when the vehicle is so constructed, loaded or operated as to prevent the hand and arm signal from being visible, both to the front and to the rear.