309.39  Contracts and specifications.
  The various contracts for the carrying out of said construction program or project in the most efficient, practicable and economical manner shall, as far as possible, be accompanied by standard specifications, and no traveled roadway shall be less than twenty-two feet from shoulder to shoulder.
[C31, 35, §4644-c41; C39, §4644.39; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §309.39]