For payment of allowances for subsistence and transportation expenses, you must establish policy and procedures governing:

(a) How you will implement the regulations throughout this part;

(b) A reasonable minimum driving distance per day that may be more than, but not less than an average of 300 miles per calendar day when use of a POV is used for PCS travel and when you will authorize an exception;

(c) Designation of an agency approving official who will authorize an exception to the daily minimum driving distance; and

(d) When you will authorize the use of more than one POV for PCS travel.