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Accession Number PB2013-109293
Title Use of High Intensity Reflective Sheeting In-Lieu of External Lighting of Overhead Roadway Signs.
Publication Date Jun 2013
Media Count 82p
Personal Author F. Ye G. Jackson N. M. Jackson P. J. Carlson
Abstract Effective highway signing is an important component of driver decision making, comfort, and safety. Like many agencies across the country, overhead sign lighting has been used by the Florida Department of Transportation (FDOT) to improve visibility. However, the availability of newer and more efficient retroreflective materials has created a new challenge for state transportation agencies going through sign upgrade programs and considering the need for sign lighting. FDOT initiated this study to investigate whether high intensity reflective sheeting can be used to replace overhead sign lighting. Field data was collected to assess the conditions of Florida signs in terms of the MUTCD minimum maintained retroreflectivity levels. In addition, a luminance computation model was developed to calculate sign legend luminance under various situations, including different sign lighting technologies, different geometrics and sign locations, and different amounts of sign dirt and sign aging. By comparing the calculated luminance of a specific sign at a specific situation with the legibility luminance levels required by older drivers, sign lighting needs were assessed. A life-cycle cost spreadsheet was developed and used to calculate the cost of replacing the current sign sheeting in Florida with high reflective sheeting and the cost of installing/upgrading sign lighting. Based on this analysis, we found that under the conditions considered (either on straight and flat roadways or horizontal curves, in rural areas or urban areas), the most cost effective approach to maintain overhead guide luminance is to use (installing or replacing with) induction or LED luminaires.
Keywords Decision making
Driver safety
Highway lighting
Life cycle costs
Light emitting diodes
Retroreflective materials
Sign reflectance
State transportation agencies
Traffic safety
Traffic signs

Source Agency Department of Transportation
NTIS Subject Category 50A - Highway Engineering
85H - Road Transportation
91B - Transportation & Traffic Planning
43G - Transportation
Corporate Author University of North Florida, Jacksonville.
Document Type Technical report
Title Note Final rept.
NTIS Issue Number 1321
Contract Number BDK82-977-07

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