Size and design of signal lenses (Repealed)

(a) The aspect of all signal lenses, except in pedestrian signals, shall be circular. There shall be two sizes for lenses, eight inches and twelve inches nominal diameter. (b) Arrows shall be pointed vertically upward to indicate a straight-through movement and in a horizontal direction to indicate a turn at approximately right angles. When the angle of the turn is substantially different from a right angle, the arrow should be positioned on an upward slope at an angle approximately equal to that of the turn. (c) Each arrow lens shall show only one arrow direction. The alternate display of two arrow indications in the same lens, a green arrow or a yellow arrow shall be permitted. The arrow shall be the only illuminated part of the lens visible. (d) In no case shall letters or numbers be displayed as part of a vehicular signal indication.