(a) Each red emergency reflector warning device shall be comprised of a multiplicity of red reflecting elements on each side, not less than two, front and back. Every red reflecting element shall conform, as a minimum requirement, to the specifications for Class A reflex reflectors contained in the S.A.E. Handbook, 1943 edition (published by the Society of Automotive Engineers). The aggregate candle-power output of the reflecting elements of the device when tested in a perpendicular position at one-third degree as specified by S.A.E. photometric procedure shall be not less than 12.

(b) Each reflector element shall be not less than three inches in diameter.

(c) If the reflecting surfaces of the reflector elements may be adversely affected by dust, soot, water or other foreign matters, they must be adequately sealed within the body of the units in which they are incorporated. Each reflector device shall be of such weight construction and/or dimensions as to remain stable, upright and stationary in a 40-mile-per-hour wind on any type road surface or level on which it is likely to be used. Such device shall be so constructed as to withstand reasonable shock without breakage. Each reflector must be so constructed that the reflecting elements are in a plane perpendicular to the plane of the roadway when placed thereon.

(d) Reasonable protection shall be afforded each reflecting device and the reflecting elements incorporated therein, by enclosure in a box container or rack from which the devices may be extracted for use. In the event the reflector devices are collapsible, locking means shall be provided to maintain the reflector elements in effective position while in use, and such locking means shall be readily capable of adjustment without the use of tools or specific equipment.