314.6  Highways along city limits.
  Whenever any public highway located along the corporate line of any city is an extension of a farm-to-market road, or of a primary road, it may be included in the farm-to-market road system or the primary road system, as the case may be, and may be constructed, reconstructed, improved, repaired, and maintained as a part of said road system.
[C24, §4735; C27, 31, 35, §4755-b28; C39, §4686.25, 4755.26; C46, §310.25, 313.35; C50, §308A.15; C54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §314.6]