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Citation |
Gisler WL, Rowan NJ, Ogden MA. Transp. Res. Rec. 1992; 1368: 10-17. |
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Copyright |
(Copyright © 1992, Transportation Research Board, National Research Council, National Academy of Sciences USA, Publisher SAGE Publishing) |
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DOI |
unavailable |
PMID |
unavailable |
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Abstract |
The legibility distance for various fiber-optic changeable lane-use displays was evaluated. Legibility distance for the arrow shafts of the various displays was approximately 800 ft. Legibility for the word messages was near 200 ft. The word messages were identified as being a possible source of confusion to the driver, which would effectively reduce the overall efficiency of the sign in providing information. An inverse relationship between legibility and target value was identified for the sign. Decreasing the light output of a display improved the legibility but reduced the target value at practical light output settings. The selection of operational settings for a given installation must optimize this relationship to obtain acceptable levels of legibility and target value. A small legibility distance was associated with the word messages in this study. This was partly because of the width of the individual letters, the letter spacing, and the light output within the area of the word message. Design procedures should be developed that will promote uniform application of fiber-optic technology to the field of traffic signing. Language: en |