49 CFR § 7.28 - How does DOT handle requests that concern more than one Government agency?
(a) If the release of a DOT-created record covered by this subpart would be of concern to DOT and one or more other Federal agencies, the determination as to release is made by DOT, but only after consultation with the other concerned agency.
(b) If the release of a DOT-created record covered by this subpart would be of concern to DOT and a State, local, or tribal Government, a territory or possession of the United States, or a foreign Government, the determination as to release is made by DOT, but only after consultation with the other concerned Governmental jurisdiction.
(c) DOT refers a request for a non-DOT-created record covered by this subpart (or the relevant portion thereof) for decision by the Federal agency that is best able to determine the record's exemption status (usually, this is the agency that originated the record), but only if that agency is subject to FOIA. DOT makes such referrals expeditiously and notifies the requester in writing that a referral has been made. DOT informs the requester that the Federal agency to which DOT referred the request will respond to the request, unless DOT is precluded from attributing the record in question to that agency.
(d) DOT components will handle all consultations and referrals they receive from other agencies or DOT components according to the date the FOIA request initially was received by the first agency or DOT component, not any later date.