The Public Transportation (PT), Over the Road Bus (OTRB), and Surface Transportation (ST) Information Sharing and Analysis Centers (ISACs) are a collaboration of ISACs established to support Critical Infrastructure (CI) security efforts.  By combining industry-specific knowledge with robust outreach, a dedicated analytical capability, and efficient and secure communications, the ISACs function as a clearinghouse for security-related information. 


To facilitate improved situational awareness, the PT, OTRB, and ST ISACs collect, analyze, and distribute physical and cybersecurity-related information from numerous sources, including private infrastructure, the U.S. Government and Military, law enforcement, academia, news media organizations, and the international community.  They also provide a secure, two-way reporting mechanism that enables the efficient transmission of critical alerts and advisories; thereby creating a crucial linkage between members, industry organizations, the Department of Homeland Security (DHS), the Transportation Security Administration (TSA), the U.S. Department of Transportation (DoT), the Federal Transit Administration (FTA), Cybersecurity and Infrastructure Security Agency (CISA), and other essential entities.