Titles read: "The "Grate" Highway - With modern speedy and heavy traffic - various types of road materials are continually being tried. One of the latest has steel as its main ingredient."
Various shots of road builders laying steel grating on the ground over a rubble stone foundation. The different sections of steel are bolted together to form a grid which is filled with a tar mixture. A steam roller passes over the surface so that it is ready to receive a "top dressing'.