§ 1600. Provisions of chapter uniform throughout state. The provisions of this chapter 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 local law, ordinance, order, rule or regulation in conflict with the provisions of this chapter unless expressly authorized herein. No local authority shall enact or duplicate any provision of this chapter as a local law, ordinance, order, rule or regulation, except that any local authority authorized to supersede any provision of this chapter may enact any such provision in a modified or amended form.