Section 308. Value of highway discontinued

If the necessity of such private
  road has been occasioned by the alteration or discontinuance of a public
  highway  running  through  the lands belonging to a person through whose
  lands the private road is proposed to be opened,  the  jury  shall  take
  into  consideration  the  value  of the highway so discontinued, and the
  benefit resulting to the person by reason of  such  discontinuance,  and
  shall  deduct  the  same  from  the damages assessed for the opening and
  laying out of such private road.