As the U.S. Department of Transportation works to develop transportation policies to meet 21st Century needs, perhaps the most vexing problems faced are those associated with traffic congestion on the Interstate highways which parallel our Atlantic, Pacific and Gulf coastlines. Interstate 95, I-5 and I-10 carry automobile and truck traffic far beyond their design capacities. In the major metropolitan areas, which these highways intersect, the combination of interstate and local traffic increasingly slows vehicle movements to a crawl. More traffic is on the way. Additional highway lanes and intersections will not solve these problems. Properly fashioned waterborne trailer and container services and passenger ferry operations can and should.