Section 13. Qualifications of certain employees

To  the  end that the
  employees of the department of transportation engaged  in  the  work  of
  constructing,  improving or maintaining highways under the provisions of
  this chapter may be practical  highway  builders,  the  commissioner  is
  authorized  to  indicate  to  the  civil service commission the relative
  value which should be given to experience and scientific attainments.