The provisions of Chapters 10, 11, 12, 13 and 14 of this act shall be applicable and uniform throughout this state and in all political subdivisions and municipalities therein and no local authority shall enact or enforce any ordinance, rule or regulation in conflict with the provisions of such chapters unless expressly authorized herein. Local authorities may, however, adopt additional traffic regulations which are not in conflict with the provisions of such chapters.
Laws 1961, p. 418, § 15-101.