41 C.F.R. § 301-10.7 How should I route my travel?
Title 41 - Public Contracts and Property Management
You must travel to your destination by the usually traveled route unless your agency authorizes or approves a different route as officially necessary.
Title 41: Public Contracts and Property Management
PART 301–10—TRANSPORTATION EXPENSES
Subpart A—General
§ 301-10.7 How should I route my travel?
