Section 2. Definitions

1. When used in this chapter, unless the context or
  subject matter  otherwise  requires,  the  terms  "state  department  of
  transportation,"   "state  transportation  department,"  "department  of
  transportation,"  "transportation  department,"   "department,"   "state
  commissioner   of  transportation,"  "commissioner  of  transportation,"
  "commissioner," and "state engineer," shall each be deemed to  refer  to
  and  to  mean  the  state  department  of  transportation  and the state
  commissioner of transportation, respectively.
    2. The term "county engineer"  or  "county  superintendent,"  when  so
  used,   shall   mean   the   county   engineer  of  highways  or  county
  superintendent of highways respectively.
    3. The term "town superintendent," when so used, shall mean  the  town
  superintendent of highways.
    4.  A  highway  within  the meaning of this chapter shall be deemed to
  include necessary  sluices,  drains,  ditches,  waterways,  embankments,
  retaining walls and culverts having a width of opening of twenty feet or
  less  except as provided in section two hundred and thirty, and also the
  approaches of any bridge  or  culvert  beginning  at  the  back  of  the
  abutments.  The  pavement  over  any  such bridge or culvert may also be
  included as a part of the highway provided such  pavement  is  separated
  from such structure by an earth fill.
    5. An "infant", as used in this chapter, shall mean any person who has
  not attained the age of eighteen years.