This paper discusses the physical and optical characteristics of sign materials and also the design and application of a Reflectometer as devised and used by the Kentucky Department of Highways in the testing of these materials, Accelerated weathering procedures and specification standards are described.

Field studies paralleling the laboratory work and a possible correlation between the two are described. The field work consists of several thousand individual observations covering thirty different sign surface types under actual conditions on a night-visibility driving-course. Most of the major types of surfaces now available are represented. This information is presented in the form of average effective viewing-distances for each type sign material.

In addition to ordinary sealed beam headlamps, the field observations were also made using polarized headlamps and viewers as proposed by the Polaroid Corporation in its headlighting system. Some additional aspects of the Polaroid system are discussed.

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Report Number

No. 63

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