American Association of State Highway Officials (1927). Manual and Specifications for the Manufacture, Display, and Erection of U.S. Standard Road Markers and Signs. United States. Department of Agriculture. Bureau of Public Roads. https://rosap.ntl.bts.gov/view/dot/75572
American Association of State Highway Officials. Manual and Specifications for the Manufacture, Display, and Erection of U.S. Standard Road Markers and Signs. United States. Department of Agriculture. Bureau of Public Roads, 1927. https://rosap.ntl.bts.gov/view/dot/75572.
American Association of State Highway Officials Manual and Specifications for the Manufacture, Display, and Erection of U.S. Standard Road Markers and Signs. United States. Department of Agriculture. Bureau of Public Roads, 1927, ROSA P. https://rosap.ntl.bts.gov/view/dot/75572.
The System of Standardized Signs and Markers as adopted by the .American Association of State Highway Officials at Detroit, November 1925, is described herein. These signs are developed in a set of working drawings prepared by the Bureau of Public Roads, and adopted by the Association of State Highway Officials. This set of designs is based on definite principles calculated to produce uniformity of significance in the signs themselves, and make familiarity with them easy to acquire on the part of the most casual driver. These principles are a set of shapes each having its own significance; a set of color combinations each having its own significance; a few obvious symbols; and uniformity of erection and application as described in this Manual.
American Association of State Highway Officials (1927). Manual and Specifications for the Manufacture, Display, and Erection of U.S. Standard Road Markers and Signs. United States. Department of Agriculture. Bureau of Public Roads. https://rosap.ntl.bts.gov/view/dot/75572
American Association of State Highway Officials. Manual and Specifications for the Manufacture, Display, and Erection of U.S. Standard Road Markers and Signs. United States. Department of Agriculture. Bureau of Public Roads, 1927. https://rosap.ntl.bts.gov/view/dot/75572.
American Association of State Highway Officials Manual and Specifications for the Manufacture, Display, and Erection of U.S. Standard Road Markers and Signs. United States. Department of Agriculture. Bureau of Public Roads, 1927, ROSA P. https://rosap.ntl.bts.gov/view/dot/75572.
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