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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 crude oil delivery Detroit domestic economic efficiency equipment federal feet freight movement future growth rate handling highway improvements increased Inland Water inland waterways intercity intercity freight Interstate Lakes Area Lakes Megalopolis Lakes ports Lakes Task Force Lawrence Seaway load locks major 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 projections Provinces Quebec Rai1 rail railroads reduce revenue River road route shippers tank terminals tion ton-mileage ton-miles tons towboats trade traffic trailers trends trucking industry U. S. Army U. S. Army Corps United user charges V/STOL vehicles vessels waterway system