AGENCY: Department of Transportation (DOT or the Department). ACTION: Final rule.   SUMMARY: In accordance with the Federal Civil Penalties Inflation Adjustment Act Improvements Act of 2015, this final rule provides the 2018 inflation adjustment to civil penalty amounts that may be imposed for violations of certain DOT regulations. This rule also finalizes the National Highway Traffic Safety Administration’s and the Office of the Secretary’s catchup inflation adjustment interim final rules required by the same Act. Contact Cornerstone for more information. (800) 285-2568 DATES: Effective November 27, 2018. 49 CFR Parts 107, 171, and 190