Wisconsin Administrative Code
Department of Transportation
Chapter Trans 303 - Equipment standards for special vehicles
Section Trans 303.06 - Special vehicle equipment requirements

(a) Horn. There shall be a horn in good working order audible from a distance of 200 feet. The horn shall be electrically activated. The horn shall not be a siren or compression whistle.

(b) Rear view mirror. There shall be at least one rear view mirror.

(c) Muffler. A muffler is required on all internal combustion engines. The muffler shall consist of a series of chambers of baffle plates or other mechanical design for receiving exhaust gases from the internal combustion engine and which is effective in reducing noise.

(d) Service brake. There shall be a service brake which can be applied by hand or foot or both. The braking device shall be capable of stopping the vehicle within 25 feet from a speed of 20 miles per hour.

(e) Parking brakes. There shall be parking brakes adequate to hold the vehicle on any grade on which it is operated on a surface free from snow, ice, or loose material. The parking brakes shall be capable of being applied by the driver's muscular effort or by spring action or by equivalent means. Motor bicycles registered as specially designed vehicles are exempt from this requirement.

(f) Stop lamp. There shall be at least one but not more than 2 stop lamps mounted on the same plane. Stop lamps shall be mounted no more than 54 inches nor less than 20 inches above the ground. Stop lamps shall emit a red color visible from 300 feet to the rear. Motor bicycles registered as specially designed vehicles are exempt from this requirement.

(g) Slow moving vehicle emblem. The emblem shall be mounted with the point up with the lower edge of the emblem no more than 54 inches nor less than 10 inches above the ground. The slow moving vehicle emblem shall meet the requirements of s. Trans 304.04.

(h) Flag on staff. There shall be a pennant type flag mounted on a staff at or near the rear of the vehicle. The flag shall be of durable material. The flag shall be high visibility orange. It shall be triangular shaped, no larger than 12 inches long and 6 inches high and not less than 6 inches long and 3 inches high. The staff shall not be higher than 72 inches nor less than 60 inches above the ground. The flag shall be attached to the top of the staff.

(a) Headlamp. There shall be at least one headlamp but not more than 2 headlamps mounted on the same plane. The headlamp shall be mounted not more than 54 inches or less than 24 inches above the level surface on which the vehicle stands. The headlamps must be of sufficient intensity to reveal persons and vehicles at a distance of at least 100 feet ahead.

(b) Tail lamp. There shall be at least one tail lamp but not more than 2 tail lamps. The tail lamps shall be mounted not more than 54 inches or less than 20 inches above the level surface on which the vehicle stands. The tail lamp shall emit a red light plainly visible from 500 feet to the rear.

(c) Turn signals. There shall be 2 turn signal lamps showing to the front and 2 turn signal lamps showing to the rear of the vehicle so as to indicate intention to turn right or left. Lamps showing to the front shall be located on the same level and shall project a white or amber light. Lamps showing to the rear shall be located on the same level and shall project a red or amber light to the rear and shall be plainly visible from all distances to 300 feet. Motor bicycles registered as specially designed vehicles are exempt from this requirement.

(d) Registration plate lamp. There shall be a registration plate lamp so constructed and placed as to illuminate with a white light the registration plate and to render it clearly visible from a distance of 50 feet to the rear. This lamp may be incorporated with the tail lamp. Motor bicycles registered as specially designed vehicles are exempt from this requirement.