Bridges, viaducts, and railroad crossings on municipal primary extensions.

The department may construct or aid in the construction, and may maintain bridges, viaducts, and railroad grade crossing eliminations on primary road extensions in cities. [C31, 35, §4755-d1; C39, § 4755.25; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §313.27 ] For department maintenance limitations in cities, see §313.36