Iowa Code Title VIII. Transportation [Chs. 306-330B] § 313.43. Lateral or detour routes in cities

1. Any city located on the primary road system and in which the primary road extension as officially designated does not pass through the main part or business district of such city, may designate and mark a lateral or detour route in order to facilitate such primary road traffic as may desire to get into and out of such business district.

2. Lateral or detour routes shall be marked with standard markings adopted by the department for that purpose, which markings shall clearly indicate that the lateral route is not the official primary road extension but is in fact a lateral or detour extending to the business district.

3. The cost of the markings shall be without expense to the state.