The first year of Concrete Construction's publication coincided with passage of the Federal Aid Highway Act of 1956 authorizing 41,000 miles of interstate highways. Reflecting this huge planned project, CC reported on a significant new development: the traveling form paver. “This machine operating on crawler tracks can place a 24-foot-wide slab up to 10 inches thick,” said a December 1956 article. “Used to date on highway projects in several Midwestern states, it permits rapid construction with a small paving crew to fairly accurate surface tolerances.” The photo shows that “modern slip-form paving machine” in action, as finishers with straightedges and floats do final surface finishing behind the paver but inside traveling forms.