The operator of a motor vehicle, before stopping, turning, or changing the course of such vehicle in the city, shall first see that there is sufficient space to make such movement in safety and shall give a visible or audible signal to the crossing officer, if there be such, or to the drivers of other vehicles and to pedestrians of his intentions to make such movement by raising and extending the arm and indicating with it the direction in which he wishes to turn, or shall use his turn signal if said vehicle is equipped therewith. (Ord. 22, 9-1-1970)