Section 42. Maintenance of detours during construction

The maintenance and
  repair of any highway or right of way designated by  official  order  of
  the  department  of  transportation  for  use  as  a  detour, during the
  construction, reconstruction, or improvement of a state  highway,  shall
  be  under  the supervision of the department of transportation and shall
  be paid out of the construction fund.  Such  highway  or  right  of  way
  designated  as  a  detour  by  the department of transportation shall be
  deemed as an improved highway  during  construction,  reconstruction  or
  repair,  when the detour is necessary, and shall be maintained, repaired
  and under the supervision of the department of  transportation  for  the
  period of necessity only.