Section 1223-A. School buses; required identification

All school buses, as
  defined in section one hundred forty-two  of  this  chapter,  purchased,
  leased  or  acquired  on  or  after  September  first,  nineteen hundred
  ninety-seven shall have the area code and telephone number of the  owner
  and/or  operator  printed    in three inch bold type on the rear of such
  vehicle.   Provided, however, that nothing  contained  herein  shall  be
  deemed  to  prohibit the printing of such information as herein provided
  on school buses purchased, acquired or leased prior to September  first,
  nineteen hundred ninety-seven.