BULLARD, GENERAL ROBERT LEE, “The Motor Truck’s Importance on the Battle Front of France,” National Automobile Chamber of Commerce, New York. CHATBURN, GEORGE R., “Highway Engineering--Rural Roads and Pavements,” pp. 22-28; John Wiley & Sons, New York. COLLINS, J. A., “Transportation Surveys for Rural Express Routes,” _Good Roads_, March 17, 1919. Cornell Agricultural College Bulletin No. 205; Ithaca, New York. CRISSEY, FORREST, “Our New Transportation System,” _Saturday Evening Post_, December 16, 1922, p. 14. CROSBY, W. W., “The Scientific Selection of Pavements,” _Municipal Journal_, May 29, 1913. DALTON, JAMES C., “Highways Must Be Made Self-supporting,” _Automotive Industries_, May 25, 1922. _Good Roads._--“Benefits of a National Highway System,” A committee report of the American Road Builders Association, Jan. 19, 1919. HAYDOCK, WINTERS, “The Pittsburgh Traffic Count,” _Proceedings of the Engineering Society of Western Pennsylvania_, Vol. XXVII, pp. 477-513. HIRST, A. R., “Laying out Wisconsin Trunk Line Highways,” _Good Roads_. HORINE, M. C., “Economics of Motor Transport,” _Journal of the Society of Automotive Engineers_, May, 1922. JAMES, E. W., “Distribution of Traffic on a Rectangular System,” _Engineering Record_, Vol. LXXIV, p. 439. JOHNSON, A. N., “The Traffic Census,” _Public Roads_, Dec. 1920, Appendix; also p. 16. “Traffic Census and its Use in Deciding Road Width,” _Public Roads_, July, 1921, p. 7. JADWIN, COLONEL EDGAR, “Relation of the War Department to Improved Highways.” Bulletin No. 25 of the Texas Engineering Experiment Station, Agricultural and Mechanical College of Texas, May 1, 1922, p. 40. MACDONALD, “Classification and Uses of Highways,” _Engineering News-Record_, Vol. LXXXIII, pp. 984-985, 635. Massachusetts Highway Commission Report, 1912. SIMONDS, FRANK H., “History of the World War,” Vol. I, p. 118, Vol. V, p. 115. Doubleday, Page & Company, New York. New Jersey State Highway Commission, Committee Report on Traffic Census--_Engineering News-Record_, Vol. LXXXVI, p. 338. TAYLOR, COLONEL B., “Similarity of Military and Commercial Motor Transportation,” National Automobile Chamber of Commerce, New York. United States Bureau of Public Roads, “A Study of the California Highway System,” _Public Roads_, pp. 124, 136-138, 196-197, 200-209. United States Census Reports. United States Department of Agriculture, Bureau of Statistics Bulletin 49. Bureau of Forestry Bulletin. FOOTNOTES [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.