The terrorist attacks of September 11, 2001, have disrupted a benefit that Americans have taken for grantedłthe ability to travel conveniently, safely, and at reasonable cost. Much of the success and efficiency of the U.S. transportation system is attributable to easy and convenient access by travelers and shippers - yet these attributes also make the system vulnerable to terrorist attack. Greater attention must focus on improving transportation system security; research must play an important role. This article identifies and assesses critical issues in transportation, including security, safety, congestion, environment, infrastructure, and new technologies.
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