摘要 :
The main objective of this research was to compare the legibility distance of the negative-contrast (i.e., darker letters on a lighter background) Clearview Typeface System with that of comparable Standard Highway Alphabets on bla...
展开
The main objective of this research was to compare the legibility distance of the negative-contrast (i.e., darker letters on a lighter background) Clearview Typeface System with that of comparable Standard Highway Alphabets on black-on-white signs in the daytime and nighttime for older and younger motorists. Mixed-case Clearview was compared to both mixed and all-uppercase Standard Highway Alphabets Series C, D, and E. (Mixed-case words have an initial capital letter followed by all lower-case letters. All uppercase words are the standard condition of regulatory, warning, and work zone signs.) These typefaces were selected for study, as they are the most commonly used typefaces in negative-contrast applications. In addition, the researchers at the Thomas D. Larson Pennsylvania Transportation Institute at Penn State evaluated the effects of inter-letter spacing and letter height on the legibility distance of mixed-case Clearview 2-B, 3-B, and 4-B. A small set of white-on-green (positive contrast) signs were displayed as well, comparing Clearview Typefaces 2-W, 3-W, and 4-W with Standard Highway Alphabet Series C, D, and E, all in mixed-case. This research was planned as Part 1 of a three-part study effort into the readability of negative-contrast highway signs. Part 1 would identify the relative legibility of various typefaces and mixed versus all uppercase words. Part 2 would address recognition, or the understanding of messages, using various typefaces in both uppercase and mixed case. Part 3 would address figure/field and format to learn how display variables may enhance sign readability.
收起
摘要 :
Texas Department of Transportation (TxDOT) sponsored research has shown that the Clearview font provides longer legibility distances than the traditional highway gothic font Series E (Modified) when used on freeway guide signs. Ad...
展开
Texas Department of Transportation (TxDOT) sponsored research has shown that the Clearview font provides longer legibility distances than the traditional highway gothic font Series E (Modified) when used on freeway guide signs. Additional studies have shown that Clearview outperforms other versions of highway gothic fonts on other smaller types of guide signs. These results, which were all carried out using positive contrast signs, have helped support the adoption of the Clearview font into FHWAs Standard Highway Signs book. The approval of the Clearview font in the Standard Highway Signs book has allowed a new version of Clearview to be used on negative contrast signs. These signs include those with white, yellow, orange, and yellow-green backgrounds. At present, TxDOT plans to continue using the standard highway gothic font for negative contrast signs. However, if research were to find a benefit to using Clearview for negative contrast signs, TxDOT could implement Clearview for all signs used by the department, simplifying sign fabrication processes. This research is focused on the viability of adopting Clearview for negative contrast signs based on visibility performance measures. The research also addresses potential changes in sign design/layout that may be needed to implement Clearview.
收起
