References
- Subcommittee on Roadway Sign Lighting of the Roadway Lighting Committee of the IES, “Roadway sign illumination,” Journal of the Illuminating Engineering SocietY, Vol. 4, No. 1, October 1974, p. 78.
- IES Lighting Handbook, Application Volume, Illuminating Engineering Society of North America, 345 East 47th Street, New York, NY, 1981.
- “Manual on uniform traffic control devices, Sec. 2A–11,” Federal Highway Administration, U.S. Department of Transportation, Washington, DC, 1978.
- T. M. Allen, “Night legibility distances of highway signs,” Highway Research Board Bulletin, No. 191, 1958, pp. 33–40.
- T. M. Allen, et al., “Luminance requirements for illuminated signs,” Highway Research Record No. 179, 1967, pp. 16–37.
- T. M. Allen and A. L. Straub, “Sign brightness and legibility,” Highway Research Board Bulletin No. 127, 1955, pp. 1–22.
- T. W. Forbes, “Factors in highway sign visibility,” Traffic Engineering, 1969, pp. 1–8.
- T. W. Forbes, et al., “Color and brightness factors in stimulated and full-scale traffic sign visibility,” Highway Research Record No. 216, 1968, pp. 55–65.
- T. W. Forbes and R. S. Holmes, “Legibility distances of highway destination signs in relation to letter height, letter width, and reflectorization,” Proceedings, Highway Research Board, 1939, pp. 321–335.
- Subcommittee on Photometry of Outdoor Luminaires of the Committee on Testing Procedures of the IES, “IES guide for photometric measurements of roadway sign installations,” Journal of the Illuminating Engineering SocietY, Vol. 5, No. 4, July 1976, p. 244.
- I. Lewin, “A luminance approach to highway sign lighting,” Journal of the Illuminating Engineering SocietY, Vol. 3, No. 2, January 1974, p. 122.
- F. W. Mills, “The comparative visibility of standard luminous and non-luminous signs,” Public Roads, 1933, pp. 14, 109–128.
- O. W. Richards, “Vision at levels of night road illumination XIII. Changes of acuity and contrast sensitivity with age,” American Journal of Optometry, 1966, pp. 43, 313–319.
- W. P. Youngblood and H. L. Woltman, “A brightness inventory of contemporary signing materials for guide signs,” Highway Research Record, No. 377, 1971.