The AASHTO Transportation Operations Manual, First Edition (2023), is a resource for transportation agencies developing and sustaining transportation systems management and operations capabilities. Early chapters introduce the manual, explain transportation systems management and operations concepts, and address agency context, readiness, and program planning. Subsequent chapters cover planning and funding for operations tactics, performance management, systems engineering and technology management, organization and workforce, and collaboration and outreach. The manual then moves to tactical elements, with chapters on event management, arterial and freeway management, freight operations, active demand and parking management, transit tactics, and tolling and road pricing. Closing chapters address technology trends and industry trends affecting operations practice. It is intended for transportation leaders and practitioners defining and supporting operations programs at strategic, programmatic, and tactical levels.