B. The display on each side of a changeable sign:

(1) May be changed no more than once every 20 minutes, unless the municipality in which the sign is located adopts an ordinance to the contrary and notifies the Department of Transportation in writing of that ordinance.__If a municipal ordinance is adopted, the municipality is responsible for the administration of that ordinance;

(2) Must change as rapidly as technologically practicable, with no phasing, rolling, scrolling, flashing or blending, unless the municipality in which the sign is located adopts an ordinance to the contrary and notifies the Department of Transportation in writing of that ordinance. If a municipal ordinance is adopted, the municipality is responsible for the administration of that ordinance. Notwithstanding this subparagraph, a municipality may not adopt an ordinance that allows the sign to flash; and

(3) May consist only of alphabetic or numeric text on a plain background and may not include any graphic, pictorial or photographic images.

Sec. 4. 29-A MRSA §2054, sub-§2, ¶C, as amended by PL 2005, c. 314, §12, is further amended to read:

C. The use of amber lights on vehicles is governed by the following.

(1) A vehicle engaged in highway maintenance or in emergency rescue operations by civil defense and public safety agencies and a public utility emergency service vehicle may be equipped with auxiliary lights that emit an amber light.

(2) A wrecker must be equipped with a flashing light mounted on top of the vehicle in such a manner as to emit an amber light over a 360` angle. The light must be in use on a public way or a place where public traffic may reasonably be anticipated when servicing, freeing, loading, unloading or towing a vehicle.

(3) A vehicle engaged in snow removal or sanding operations on a public way must be equipped with and display at least 2 an auxiliary lights mounted on the