Primary roads, and extensions of primary roads within cities are hereby designated as through highways. [C27, 31, 35, §5079-b1; C39, § 5029.10; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §321.350 ]
Primary roads as through highways.
Iowa Code § 321.350, under MOTOR VEHICLES AND LAW OF THE ROAD.
Iowa Code § 321.350