Hazard warning lights and reflectors on farm equipment — Slow-moving vehicle emblem.
RCW 46.37.160
in effect(1) Every farm tractor and every self-propelled unit of farm equipment or implement of husbandry manufactured or assembled after January 1, 1970, shall be equipped with vehicular hazard warning lights of the type described in RCW 46.37.215 visible from a distance of not less than one thousand feet to the front and rear in normal sunlight, which shall be displayed whenever any such vehicle is operated upon a highway. (2) Every self-propelled unit of farm equipment or implement of husbandry manufactured or assembled after January 1, 1970, shall at all times, and every other motor vehicle shall at times mentioned in RCW 46.37.020 , be equipped with lamps and reflectors as follows: (a) At least two headlamps meeting the requirements of RCW 46.37.220 , 46.37.240 , or 46.37.260 ; (b) At least one red lamp visible when lighted from a distance of not less than one thousand feet to the rear mounted as far to the left of center of vehicle as practicable; (c) At least two red reflectors visible from all distances within six hundred to one hundred feet to the rear when directly in front of lawful lower beams of headlamps. (3) Every combination of farm tractor and towed farm equipment or towed implement of husbandry shall at all times mentioned in RCW 46.37.020 be equipped with lamps and reflectors as follows: (a) The farm tractor element of every such combination shall be equipped as required in subsections (1) and (2) of this section; (b) The towed unit of farm equipment or implement of husbandry element of such combination shall be equipped on the rear with two red lamps visible when lighted from a distance of not less than one thousand feet to the rear, and two red reflectors visible to the rear from all distances within six hundred feet to one hundred feet to the rear when directly in front of lawful upper beams of head lamps. One reflector shall be so positioned to indicate, as nearly as practicable, the extreme left projection of the towed unit; (c) If the towed unit or its load obscures either of the vehicle hazard warning lights on the tractor, the towed unit shall be equipped with vehicle hazard warning lights described in subsection (1) of this section. (4) The two red lamps and the two red reflectors required in the foregoing subsections of this section on a self-propelled unit of farm equipment or implement of husbandry or combination of farm tractor and towed farm equipment shall be so positioned as to show from the rear as nearly as practicable the extreme width of the vehicle or combination carrying them: PROVIDED, That if all other requirements are met, reflective tape or paint may be used in lieu of reflectors required by subsection (3) of this section. (5) After January 1, 1970, every farm tractor and every self-propelled unit of farm equipment or implement of husbandry designed for operation at speeds not in excess of twenty-five miles per hour shall at all times be equipped with a slow moving vehicle emblem mounted on the rear except as provided in subsection (6) of this section. (6) After January 1, 1970, every combination of farm tractor and towed farm equipment or towed implement of husbandry normally operating at speeds not in excess of twenty-five miles per hour shall at all times be equipped with a slow moving vehicle emblem as follows: (a) Where the towed unit is sufficiently large to obscure the slow moving vehicle emblem on the farm tractor, the towed unit shall be equipped with a slow moving vehicle emblem. In such cases, the towing vehicle need not display the emblem; (b) Where the slow moving vehicle emblem on the farm tractor unit is not obscured by the towed unit, then either or both may be equipped with the required emblem but it shall be sufficient if either has it. (7) The emblem required by subsections (5) and (6) of this section shall comply with current standards and specifications as promulgated by the Washington state patrol.
(1) Every farm tractor and every self-propelled unit of farm equipment or implement of husbandry manufactured or assembled after January 1, 1970, shall be equipped with vehicular hazard warning lights of the type described in RCW 46.37.215 visible from a distance of not less than one thousand feet to the front and rear in normal sunlight, which shall be displayed whenever any such vehicle is operated upon a highway.
(2) Every self-propelled unit of farm equipment or implement of husbandry manufactured or assembled after January 1, 1970, shall at all times, and every other motor vehicle shall at times mentioned in RCW 46.37.020 , be equipped with lamps and reflectors as follows:
(a) At least two headlamps meeting the requirements of RCW 46.37.220 , 46.37.240 , or 46.37.260 ;
(b) At least one red lamp visible when lighted from a distance of not less than one thousand feet to the rear mounted as far to the left of center of vehicle as practicable;
(c) At least two red reflectors visible from all distances within six hundred to one hundred feet to the rear when directly in front of lawful lower beams of headlamps.
(3) Every combination of farm tractor and towed farm equipment or towed implement of husbandry shall at all times mentioned in RCW 46.37.020 be equipped with lamps and reflectors as follows:
(a) The farm tractor element of every such combination shall be equipped as required in subsections (1) and (2) of this section;
(b) The towed unit of farm equipment or implement of husbandry element of such combination shall be equipped on the rear with two red lamps visible when lighted from a distance of not less than one thousand feet to the rear, and two red reflectors visible to the rear from all distances within six hundred feet to one hundred feet to the rear when directly in front of lawful upper beams of head lamps. One reflector shall be so positioned to indicate, as nearly as practicable, the extreme left projection of the towed unit;
(c) If the towed unit or its load obscures either of the vehicle hazard warning lights on the tractor, the towed unit shall be equipped with vehicle hazard warning lights described in subsection (1) of this section.
(4) The two red lamps and the two red reflectors required in the foregoing subsections of this section on a self-propelled unit of farm equipment or implement of husbandry or combination of farm tractor and towed farm equipment shall be so positioned as to show from the rear as nearly as practicable the extreme width of the vehicle or combination carrying them: PROVIDED, That if all other requirements are met, reflective tape or paint may be used in lieu of reflectors required by subsection (3) of this section.
(5) After January 1, 1970, every farm tractor and every self-propelled unit of farm equipment or implement of husbandry designed for operation at speeds not in excess of twenty-five miles per hour shall at all times be equipped with a slow moving vehicle emblem mounted on the rear except as provided in subsection (6) of this section.
(6) After January 1, 1970, every combination of farm tractor and towed farm equipment or towed implement of husbandry normally operating at speeds not in excess of twenty-five miles per hour shall at all times be equipped with a slow moving vehicle emblem as follows:
(a) Where the towed unit is sufficiently large to obscure the slow moving vehicle emblem on the farm tractor, the towed unit shall be equipped with a slow moving vehicle emblem. In such cases, the towing vehicle need not display the emblem;
(b) Where the slow moving vehicle emblem on the farm tractor unit is not obscured by the towed unit, then either or both may be equipped with the required emblem but it shall be sufficient if either has it.
(7) The emblem required by subsections (5) and (6) of this section shall comply with current standards and specifications as promulgated by the Washington state patrol.
Source: WA Statutes (Official Site)URL: https://app.leg.wa.gov/RCW/default.aspx?cite=46.37&full=trueFetched: 6/29/2026