Chap. 574. AN ACT AUTHORIZING CITIES AND TOWNS TO ERECT AND MAINTAIN TRAFFIC SIGNS AND DEVICES. Be it enacted, etc., as follows: Section 2 of chapter 85 of the General Laws is hereby amended by striking out the fifth sentence, as appearing in section 1 of chapter 646 of the acts of 1951, and inserting in place thereof the following sentence:— No rule, regulation, order, ordinance or by-law of a city or town hereafter made or promulgated relative to or in connection with such signs, lights, signal systems, traffic devices, parking meters or markings on any way within its control shall take effect until approved in writing by the department, or be effective after said approval is revoked; provided, however, that if said approval, or a denial in writing, is not issued by the department within sixty days after receipt of written application by registered mail for approval by Acts, 1974. —