DOT FOIA Regulations, 49 CFR, Part 7
This regulation is the primary implementation vehicle for FOIA within the Department of Transportation. With the exception of FHWA N1320.6 (FOIA - Predisclosure Notification to Submitters of Confidential Commercial Information), the FHWA does not have a FOIA regulation or directive of its own, but relies on 49 CFR, Part 7. Information regarding fees for FOIA services can be found at this link. DOT completely revised its FOIA regulations in 1998.