(a) A motor carrier with multiple offices or terminals may maintain the records and documents required by this subchapter at its principal place of business, a regional office, or driver work-reporting location unless otherwise specified in this subchapter.

(b) All records and documents required by this subchapter which are maintained at a regional office or driver work-reporting location shall be made available for inspection upon request by a special agent or authorized representative of the Federal Motor Carrier Safety Administration at the motor carrier's principal place of business or other location specified by the agent or representative within 48 hours after a request is made. Saturdays, Sundays, and Federal holidays are excluded from the computation of the 48-hour period of time.