The purpose of the Safety Funding Parity Adjustment Act of 2025 is to establish a clear process for the Secretary of Transportation to adjust funding related to highway safety programs. The goal is to ensure that funding for these programs is allocated fairly and effectively, particularly between two specific funding sources: section 402 and section 405 of title 23 of the United States Code. Key provisions of this act outline how the Secretary of Transportation must assess funding levels before distributing money for highway safety.