[skyl4rk]

It looks like it is probably not legal to use a flashing yellow light in MI unless you fall under some type of emergency or service vehicle status.

MCL 257.698

(5) The use or possession of flashing, oscillating, or rotating lights of any color is prohibited except as otherwise provided by law, or under the following circumstances:

(a) A police vehicle shall be equipped with flashing, rotating, or oscillating red or blue lights, for use in the performance of police duties.

(b) A fire vehicle or ambulance available for public use or for use of the United States, the state, or any unit of the state, whether publicly or privately owned, shall be equipped with flashing, rotating, or oscillating red lights and used as required for safety.

(c) An authorized emergency vehicle as defined in section 2 may be equipped with flashing, rotating, or oscillating red lights for use when responding to an emergency call if when in use the flashing, rotating, or oscillating red lights are mounted on the roof section of the vehicle, either as a permanent installation or by means of suction cups or magnets and are clearly visible in a 360 degree arc from a distance of 500 feet when in use. A person operating lights under this subdivision at any time other than when responding to an emergency call is guilty of a misdemeanor.

(d) Flashing, rotating, or oscillating amber lights, placed in a position as to be visible throughout an arc of 360 degrees, shall be used by a state, county, or municipal vehicle engaged in the removal of ice, snow, or other material from the highway and in other operations designed to control ice and snow.

(e) A vehicle used for the cleanup of spills or a necessary emergency response action taken pursuant to state or federal law or a vehicle operated by an employee of the department of natural resources that responds to a spill, emergency response action, complaint, or compliance activity may be equipped with flashing, rotating, or oscillating amber lights. Such lights shall not be activated unless the vehicle is at the scene of a spill, emergency response action, complaint, or compliance activity.

(f) A vehicle to perform public utility service, a vehicle owned or leased by and licensed as a business for use in the collection and hauling of refuse, an automobile service car or wrecker, a vehicle engaged in authorized highway repair or maintenance, a vehicle of a peace officer, a vehicle operated by a rural letter carrier or a person under contract to deliver newspapers or other publications by motor route, a vehicle utilized for snow removal, a private security guard vehicle as authorized in subsection (7), a motor vehicle while engaged in escorting or transporting an oversize load that has been issued a permit by the state transportation department or a local authority with respect to highways under its jurisdiction, a vehicle owned by the national guard or a United States military vehicle while traveling under the appropriate recognized military authority, a motor vehicle while towing an implement of husbandry, or an implement of husbandry may be equipped with flashing, rotating, or oscillating amber lights. However, a wrecker may be equipped with flashing, rotating, or oscillating red lights which shall be activated only when the wrecker is engaged in removing or assisting a vehicle at the scene of a traffic accident or disablement. The flashing, rotating, or oscillating amber lights shall not be activated except in those circumstances that the warning produced by the lights is required for public safety.

(g) A vehicle engaged in leading or escorting a funeral procession or any vehicle that is part of a funeral procession may be equipped with flashing, rotating, or oscillating purple or amber lights which shall not be activated except during a funeral procession.

(h) An authorized emergency vehicle may display flashing, rotating, or oscillating white lights in conjunction with an authorized emergency light as prescribed in this section.

(i) A private motor vehicle of a physician responding to an emergency call may be equipped with and the physician may use flashing, rotating, or oscillating red lights mounted on the roof section of the vehicle either as a permanent installation or by means of magnets or suction cups and clearly visible in a 360 degree arc from a distance of 500 feet when in use. The physician shall first obtain written authorization from the county sheriff.

(j) A public transit vehicle may be equipped with a flashing, oscillating, or rotating light mounted on the roof of the vehicle approximately 6 feet from the rear of the vehicle which displays a white light to the front, side, and rear of the vehicle, which light may be actuated by the driver for use only in inclement weather such as fog, rain, or snow, when boarding or discharging passengers, from 1/2 hour before sunset until 1/2 hour after sunrise, or where conditions hinder the visibility of the public transit vehicle. As used in this subdivision, “public transit vehicle” means a motor vehicle, other than a station wagon or passenger van, with a gross vehicle weight rating of more than 10,000 pounds.

(k) A person engaged in the manufacture, sale, or repair of flashing, rotating, or oscillating lights governed by this subsection may possess the lights for the purpose of employment, but shall not activate the lights upon the highway unless authorized to do so under subsection (6).