D.C. Mun. Regs. tit. 6, r. 6-B4032
Local travel expenses shall be approved by the agency's authorizing official or his or her designee.
An agency's authorizing official may delegate to supervisory personnel in the agency the authority to approve their supervised employees' local travel if the local travel includes only subway, bus, taxi, or ride-hailing expenses or involves only the use of a government vehicle.
Employee requests and agency approvals for local travel need not be in writing, if the agency head authorizes oral requests and approvals.
An employee shall obtain approval in advance of the local travel and in advance of incurring any local travel expenses unless the authorizing official determines there is good cause for obtaining approval after the local travel.
In order to receive written authorization to engage in local travel and incur local travel expenses, an employee shall prepare and submit to the authorizing official or the agency's travel officer a local travel authorization form.
The employee shall request authorization for local travel at least ten (10) calendar days before any local travel expenses are expected to be incurred; except, if the employee only becomes aware of the need to incur local travel expenses within ten (10) calendar days before any local travel expenses are expected to be incurred, the employee shall submit the form as promptly as possible after the employee becomes aware of the need to incur local travel expenses.
An authorizing official or his or her designee (or supervisory personnel with delegated authority under § 4032.2) may authorize local travel only if he or she determines that the travel and associated expenses are consistent with the principles set forth in § 4000.
D.C. Mun. Regs. tit. 6, r. 6-B4032