With few pipelines in the state, convoys of thousands of 18-wheelers and tank cars carry two-thirds of all crude oil to refineries as far away as 2,000 miles.
  Credit:
  Yva Momatiuk & John Eastcott  
     
          With few pipelines in the state, convoys of thousands of 18-wheelers and tank cars carry two-thirds of all crude oil to refineries as far away as 2,000 miles.