EVALUATION OF CLEARVIEW ALPHABET WITH MICROPRISMATIC RETROREFLECTIVE SHEETINGS
This project was conducted to determine the legibility of the Clearview alphabet on freeway guide signs constructed with microprismatic retroreflective sheeting. The Clearview legibility results were compared to the legibility of freeway guide signs constructed with the Series E (Modified) alphabet. Also included in the analysis were legibility distances of freeway guide signs constructed with Type III sheeting. A total of 60 subjects divided into three age groups participated in this nighttime study. The findings indicate that the Clearview alphabet provides statistically longer legibility distances than the Series E (Modified) alphabet. The findings also show that microprismatic sheeting provides statistically longer legibility distances than Type III sheeting. Sequentially, the differences between Type III guide signs with Series E (Modified) legends, microprismatic guide signs with Series E (Modified) legends, and microprismatic guide signs with Clearview legends were modest. However, the combined effect of switching from Type III guide signs with Series E (Modified) legends to microprismatic guide signs with Clearview legends was noteworthy. For overhead signs, the combined effect resulted in an overall mean legibility distance improvement of 70 ft, or 11.9%. For shoulder-mounted guide signs, the improvement was 74 ft, or 12.0%. Furthermore, the largest legibility distance improvements of the Clearview alphabet were associated with older drivers.
- Record URL:
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Supplemental Notes:
- Research Project Title: Evaluation of Clearview Alphabet with Super High Intensity Prismatic Sheeting. Published: August 2001; Resubmitted: October 2001.
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Corporate Authors:
Texas Transportation Institute
Texas A&M University System, 1600 E Lamar Boulevard
Arlington, TX United States 76011Texas Department of Transportation
Research and Technology Transfer Office, P.O. Box 5051
Austin, TX United States 78763-5051Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC United States 20590 -
Authors:
- Carlson, P J
- Publication Date: 2001-10
Language
- English
Media Info
- Features: Figures; Photos; References; Tables;
- Pagination: 88 p.
Subject/Index Terms
- TRT Terms: Age groups; Aged drivers; Guide signs; Legibility; Lettering; Retroreflectivity; Sign sheeting
- Uncontrolled Terms: Alphabets; Microprismatic retroreflective sheeting
- Subject Areas: Highways; Operations and Traffic Management; Safety and Human Factors; Society; I73: Traffic Control;
Filing Info
- Accession Number: 00824649
- Record Type: Publication
- Report/Paper Numbers: FHWA/TX-02/4049-1,, Research Report 4049-1,, TTI: 0-4049
- Contract Numbers: Project No. 0-4049
- Files: NTL, TRIS, USDOT, STATEDOT
- Created Date: Feb 25 2002 12:00AM