Show useful portable highways worse than snowdrifts snow drifts for blocking roadways are the grent great clouds of s sand and that whirl over the he famed sandhills sand hills of imperial county in southern california always after such puch it a storm tons of sand must be reme removed ed or a new roadway laid engineers are meeting the difficulty with a portable highway 18 feet wide alys popular science monthly after a severe sandstone Bands sands tonn a 4 tru truck ek equipped with a crane lifts up a section of the roadway shaker lit t clear of sand and replaces it IL |