Show beating the shifting sands confronted by the task of building a highway over a desert of constantly shifting sands which in a few years might cover and render useless a roadbed of macadam or concrete the california highway commission lids his introduced a type of paving which ls Is portable so that it can be easily moved to conform to the changing topography of tile the country popular mechanics magazine describes the paving ns as made of plank built in sections 12 feet long and 8 feet wide and hauled by wagons to the points where it Is this unused thoroughfare extends six miles across a portion of the desert lying between yuma ariz and Holt holtville ville cal the plank sections are built on 4 by cinch C inch stringers the units tire are bound together by iron fron strips placed over rows of spikes one either side and one along tile the center of the road Roundhead cd bolts running through the planks and stringers are used to hold the strips down the latter in addition to joining the units unit together keep the spikes from working out of the lumber |