Section 84. Construction or reconstruction of any road or highway in connection with projects on the principal secondary and feeder roads

The  commissioner  of  transporation  may,  upon the request of a county
  through its board of supervisors, include in any project on the  federal
  principal  secondary  and  feeder road system, any work of construction,
  reconstruction or improvement of any road or  highway  that  is  located
  within  the  boundaries  of  such  county  and  that  is or shall form a
  continuation or extension of any such  principal  secondary  and  feeder
  road  or  shall be in connection therewith. Whenever the commissioner of
  transportation shall approve such a request of a county, he shall  cause
  surveys  and  plans to be made either by the county or by the department
  of transportation. Estimates of the construction and  engineering  costs
  shall  be  made  and submitted to the commissioner of transportation for
  approval.  If  approved,  such  county  shall  thereupon  deposit   such
  estimated  amounts  of monies with the comptroller, who is authorized to
  receive and accept the same for the purpose of this section, subject  to
  the draft or requisition of the commissioner of transportation. Upon the
  completion  and acceptance of the construction work, the commissioner of
  transportation shall render to the board of supervisors of  such  county
  an  itemized  statement showing in full the amount of money deposited by
  such county with  the  comptroller  as  hereinbefore  provided  and  all
  expenditures  made  for  the construction and engineering work connected
  therewith made pursuant to this section. Any surplus money shall be paid
  to such county on the warrant of the comptroller  on  vouchers  therefor
  approved by the commissioner of transportation.