"In the wake of the September 11 attacks, the Transportation Systems Sector joined together in an unprecedented way to protect its customers, systems, and assets. The private sector has made greatcontributions in sector-wide risk-reduction efforts, often of their own volition. State and local governments likewise reacted swiftly to the attacks, enhancing first-response capabilities, increasing vigilance, and securing potential targets. This type of cooperation among the diverse sector stakeholders is one of the strengths of the Transportation Systems Sector.
In addition to ongoing efforts, there is a distinct set of strategic risks where the Federal Government will add special value. These risks exhibit two distinguishing characteristics: First, they present issues that raise complex implementation issues for industry, and State and localgovernments. Second, they have a very high materiality (i.e., very significant consequence and plausible likelihood). Strategic risks, such as the use of some element of the transportation network as a weapon of mass destruction (WMD), have a multi-jurisdictional and sector-wide effect. Therefore, Federal involvement will improve the sector's risk management posture by focusing on system-wide risk. In the face of the reality that terrorists will continue to target the transportation network, a systems based risk management (SBRM) strategy that lays out a strategic framework to improve the sector's risk management posture is necessary. This strategy focuses on implementing multiple layers of security to defeat and deter the more plausible and dangerous forms of attack against the Nation's transportation network. Importantly, the SBRM process is strategic in nature, yielding strategic countermeasures, and does not directly address operational or tactical plans."