Section 16. Vacations

The board of transportation shall grant to every
  employee under its supervision, who shall have been in such  employ  for
  at  least  one  year, a vacation of not less than two weeks in each year
  and for employees  in  such  employ  less  than  one  year,  a  vacation
  pro-rated  on  the  basis of one day per month while in such employ, and
  for such further period of time as in the opinion and judgment  of  such
  board,  the  duties, position, length of service and other circumstances
  may warrant, at such time as such board may fix. During  such  vacations
  such  employees  shall  be  allowed the same compensation as if actually
  employed.