freight bottom line report presented to aashto standing committee on rail transportation by david hunt cambridge systematics inc prepared boston logistics group global insight transystems corporation september 11 2006 comprehensive of in the us current snapshot forecasts issues policy options covers demand and highway water importance system trends share is modest 79 94 61 14 5 29 7 1 9 0 10 20 30 40 50 60 70 80 90 100 tons value ton miles truck source 2004 transearch but public benefits are substantial adds capacity reduces costs promotes economic development productivity supports international trade more fuel efficient generates less air pollution per mile than trucks improves safety security offering a naturally separated right way for preferred hazmats provides emergency response during national emergencies military mobilization