Amends GS 20-141(d) to authorize the Department of Transportation (DOT) to increase the speed limit to 75 miles per hour upon any part of a highway designated as part of the Interstate Highway System or any part of a controlled-access highway (either inside or outside the corporate limits of a municipality) where it is reasonable and safe to do so. (Currently, DOT may only increase the speed limit to 70 miles per hour.) 

Makes conforming changes to GS 20-141(j1) to also make it a Class 3 misdemeanor when a person drives over 85 miles per hour where the maximum speed is 75 miles per hour.  Makes conforming changes to GS 20-16 (authority of division to suspend driver’s license upon specified convictions) and GS 20-16.1 (mandatory suspension of a driver’s license without a preliminary hearing on receiving record of specified convictions) to account for the new speed limit. Effective December 1, 2023, and applies to offenses committed on or after that date. 

Specifies that prosecutions for offenses committed before the effective date of the act are not abated or affected by the act, and the statutes that would be applicable but for the act remain applicable to those prosecutions.