Statistical records indicate more than $3 million was spent each year in fiscal 1963, 1964, and 1965 for erosion control on Oklahoma roads and highways. The cost of erosion control in 1965 was $15, 900.00 per mile, and one year later (fiscal 1966) the cost had risen to $23,000.00 per mile, an increase of approximately 45 percent. The construction of more roads and highways each year added to the more than 12,000 miles now in Oklahoma makes the need for satisfactory and economical means of maintenance even more urgent.