A different sort of transportation network

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http://usdotblog.typepad.com/.a/6a00e551eea4f5883401310fcfa6ea970c-pi

A map of a vital transportation network in the United States that's often out of sight, and out of mind: the pipeline system of the continental United States. This network is sees oversight via the 5-year old Pipelines and Hazardous Materials Safety Administration at the Department of Transportation.