41 C.F.R. § 301-70.500

Each agency must establish policies and procedures to determine—

(a) When the agency will authorize employee emergency travel under part 301-30 of this chapter;

(b) Who will determine if an employee's situation warrants payment for emergency travel expenses;

(c) When and by whom travel to an alternate location other than the official station or point of interruption will be authorized; and

(d) Who will determine when and if the definition of immediate family may be extended and to whom.