1. Any person who shall place or drive or cause to be placed or driven upon or along any state or supplementary state highway of this state any animal-driven vehicle whatsoever, whether in motion or at rest, shall after sunset to one-half hour before sunrise have attached to every such vehicle at the rear thereof a red taillight or a red reflecting device of not less than three inches in diameter of effective area or its equivalent in area. When such device shall consist of reflecting buttons there shall be no less than seven of such buttons covering an area equal to a circle with a three-inch diameter. The total subtended effective angle of reflection of every such device shall be no less than sixty degrees and the spread and efficiency of the reflected light shall be sufficient for the reflected light to be visible to the driver of any motor vehicle approaching such animal-drawn vehicle from the rear of a distance of not less than five hundred feet.

2. In addition, any person who operates any such animal-driven vehicle during the hours between sunset and one-half hour before sunrise shall have at least one light flashing at all times the vehicle is on any highway of this state. Such light or lights shall be amber in the front and red in the back and shall be placed on the left side of the vehicle at a height of no more than six feet from the ground and shall be visible from the front and the back of the vehicle at a distance of at least five hundred feet. Any person violating the provisions of this section shall be guilty of an infraction.

3. Any person operating an animal-driven vehicle during the hours between sunset and one-half hour before sunrise may, in lieu of the requirements of subsection 2 of this section, use lamps or lanterns complying with the rules promulgated by the director of the department of public safety.

4. Any rule or portion of a rule, as that term is defined in section 536.010, that is created under the authority delegated in this section shall become effective only if it complies with and is subject to all of the provisions of chapter 536 and, if applicable, section 536.028. This section and chapter 536 are nonseverable and if any of the powers vested with the general assembly pursuant to chapter 536 to review, to delay the effective date, or to disapprove and annul a rule are subsequently held unconstitutional, then the grant of rulemaking authority and any rule proposed or adopted after August 28, 2004, shall be invalid and void.