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Many companies or governmental entities provide or use transportation systems that are heavily dependent on computers, software, and other technologies that do not have Y2K problems, e.g., they are Y2K compliant or ready. Some transportation systems, however, still use technologies with Y2K problems, which if left uncorrected, could pose safety risks or efficiency concerns on or after January 1, 2000. The extent and nature of those impacts are expected to vary among the modes of transportation and among various providers or users. In addition, Y2K-related problems occurring in the communications and energy industries could reduce the safety and efficiency of some transportation systems in early January 2000. Operations at some foreign ports and international air traffic control systems with Y2K problems also could adversely affect shipments and flights into and out of the United States. The total amount that has been spent to assess and fix Y2K problems affecting transportation is not known, but estimates suggest that at least $1 billion of private sector, transit authority, and federal funds have been or will soon be allocated for that purpose.