This part prescribes the requirements necessary to implement 23 U.S.C. 163,which.08 BAC per se laws through the use of incentive grants and Section 351 of Public Law 106-346—Appendix, which requires the withholding of Federal-aid highway funds from any State that has not enacted and is not enforcing a 0.08 BAC per se law as described in 23 U.S.C. 163.