Local authorities restricted.

Iowa Code § 321.254, under MOTOR VEHICLES AND LAW OF THE ROAD.

Iowa Code § 321.254

No local authority shall place or maintain any traffic-control device upon any highway under the jurisdiction of the department except by the latter’s permission. [C39, § 5019.03; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §321.254 ] Referred to in §331.362