"LED (light-emitting diode) technology is being widely adopted for use in sustainable traffic signal management. However, the useful life and luminosity characteristics have not been sufficiently studied in the field to provide departments of transportation with cost-effective replacement strategies based on the realities for LED indicators. LED indicators fail when their luminous intensity (LI) falls below a pre-specified threshold, posing a danger to traffic. This research details a field study of LED indicators in Missouri and develops a replacement schedule based on key findings. Rates of degradation and subsequently the useful life of each type of LED indicator were calculated using a deterministic regression model. Results of this research provide a methodology for engineering managers in state departments of transportation and local communities in identifying best practices and replacement standards for LED indicator technology"--Abstract, page iii.
Long, Suzanna, 1961-
Engineering Management and Systems Engineering
M.S. in Engineering Management
Missouri. Department of Transportation
Mid America Transportation Center
Missouri University of Science and Technology
ix, 80 pages
© 2011 Casey Robert Noll, All rights reserved.
Thesis - Restricted Access
Library of Congress Subject Headings
Traffic signs and signals -- Maintenance and repair
Electronic traffic controls -- Maintenance and repair
Electronic traffic controls -- Testing
Traffic signs and signals -- Missouri
Light emitting diodes
Print OCLC #
Electronic OCLC #
Link to Catalog RecordElectronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library.http://laurel.lso.missouri.edu:80/record=b10158417~S5
Noll, Casey Robert, "Life expectancy evaluation and replacement schedule development for LED traffic indicators" (2011). Masters Theses. 4498.