a bridge and thereby obtaining the dual lane loading allowance and then contracting again to 13 feet on the other side, all without stopping. One of these dollies was used on the rear... truss top chord sections made the overhead problem very significant. It was soon realized that a reduction in loaded height of 2 feet and pre-lifting all overhead wires would result... in the saving of travel time and thousands of dollars over the 28 loads. The sections were very strong in bending and compression and therefore capable of sustaining the forces from...