[173] Highway is sometimes used in the sense of greater importance and road in that of less, as in the expression “highways and roads.” Baker in his “Roads and Pavements” uses roads to indicate unpaved highways.
[174] See Engineering News Record, Vol. LXXXIII, p. 985.
[175] “Economies of Motor Transport,” by Merrill C. Horine, Engineer International Motor Company, New York City, in the Journal of the Society of Automotive Engineers, May, 1922.
[176] See Simonds’ “History of the World War,” Vols. I and V.
[177] “Am. Civ. Eng’s. Pocketbook,” Sec. 15, Art. 4, Wiley & Sons, N. Y.
[178] Report of Third International Road Congress, 1913.
[179] Bulletin 205, Cornell Agricultural College; Bulletin 136, U. S. Department of Agriculture; Bulletin 49, Bureau of Statistics, U. S. Dept. of Agr. Reports of the 1910 U. S. Census.
[180] From Bulletin 136, U. S. Department of Agriculture.
[181] Engineering Record, Vol. LXXIV, p. 439.
[182] See “Highway Engineering,” by G. R. Chatburn, pp. 22 to 28, Wiley & Sons, New York, publishers.