Chap. 0235 An Act authorizing police and other vehicles to display blue lights in the direction in which such vehicles are proceeding or facing. Be it enacted, etc., as follows: The ninth sentence of section 7 of chapter 90 of the General Laws, as appearing in chapter 260 of the acts of 1949, is hereby amended by inserting after the word "facing", in line 3, the following:- ; and no motor vehicle, except a vehicle used by any police department of the commonwealth or its political subdivisions solely for the official business of such department, shall display a blue light in the direction toward which the vehicle is proceeding or facing; provided, however, that the registrar by rules and regulations may permit other vehicles to display such blue lights. Approved April 12, 1951.