The provisions of this chapter shall be applicable and uniform throughout this state and in all political subdivisions and municipalities in this state. Unless expressly authorized in this chapter , a local authority shall not enact or enforce any rule or regulation in conflict with the provisions of this chapter . Local authorities may, however, adopt additional traffic regulations which are not in conflict with the provisions of this chapter . [C39, § 5017.08; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §321.235 ] 2023 Acts, ch 66, §75