25. Acting Director of Land Transport Safety---(1) In the case of
 absence from duty of the Director (from whatever cause arising) or on
 the occurrence from any cause of a vacancy in that position (whether by
 reason of death, resignation, or otherwise) and from time to time while
 the absence or vacancy continues, all or any of the powers and duties of
 the Director or pertaining to the position may be exercised and
 performed by---
   (a) Any other employee for the time being directed by the Authority to
         exercise and perform them; or
   (b) Any other person for the time being appointed by the Authority to
         exercise and perform them,---

 whether the direction has been given or the appointment has been made
 before the absence or vacancy occurs or while the absence or vacancy
 continues.

   (2) No such direction or appointment, and no acts done by any employee
 or other person acting pursuant to any such direction or appointment,
 shall in any proceedings be questioned on the ground that the occasion
 for the direction or appointment had not arisen or had ceased, or on the
 ground that the employee or other person has not been appointed to any
 position to which the direction or appointment relates.