The Central BIM Transportation Library (CBTL) and National BIM Transportation Library (NBTL) initiatives provide a shared framework for standardizing BIM artifacts across U.S. transportation infrastructure. Led by NIBS with FHWA support, these efforts define the technical, organizational, and governance requirements for a secure, scalable, and interoperable repository, enabling DOTs and industry partners to collaborate, streamline digital delivery, and advance national BIM adoption. The final report highlights outcomes, use cases, and actionable steps to support both state and federal priorities.