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air freight aircraft airlines airports American Trucking Association American Waterways Operators Appendix Figure Appendix Table average barges Canada Canadian Canal capacity carried cars Chapter commercial commodities companies competition congestion construction container ships containerized costs delivery Detroit Detroit Edison Company domestic economic efficiency equipment federal feet freight movement future growth rate handling highway Illinois Waterway improvements increased Inland Water inland waterways intercity intercity freight Interstate Interstate Commerce Commission Lakes Area Lakes Megalopolis Lakes ports Lakes Task Force Lawrence Seaway load locks major medium ment Michigan miles million modes of transportation move navigation season Ohio oil pipeline Ontario operating overseas general cargo passenger percent percentage share petroleum pipeline transportation population problems Provinces Quebec rail railroads reduce revenue River route shippers tank terminals tion tons towboats trade traffic trailers trends trucking industry U. S. Army Corps United user charges V/STOL vehicles vessels waterway system