This rule implements the Federal Civil Penalties Inflation Adjustment Act of 1990 (FCPIAA), Public Law 101-410, as amended by the Federal Civil Penalties Inflation Adjustment Act Improvements Act of 2015 (2015 Act), Public Law 114-74, 129 Stat. 599, codified at 28 U.S.C. 2461 note. The FCPIAA and the 2015 Act require Federal agencies to adjust minimum and maximum civil penalty amounts to preserve their deterrent impact. The 2015 Act amended the formula and frequency of the adjustments. It required an initial catch-up adjustment in the form of an interim final rule, followed by annual adjustments of civil penalty amounts using a statutorily mandated formula. This rule makes the Department of Transportation's update for 2025.