Masters Theses


"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-

Committee Member(s)

Qin, Ruwen
Gosavi, Abhijit


Engineering Management and Systems Engineering

Degree Name

M.S. in Engineering Management


Missouri. Department of Transportation
Mid America Transportation Center


Missouri University of Science and Technology

Publication Date

Spring 2011


ix, 80 pages

Note about bibliography

Includes bibliographical references (pages 77-79).

Geographic Coverage



© 2011 Casey Robert Noll, All rights reserved.

Document Type

Thesis - Restricted Access

File Type




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

Thesis Number

T 10206

Print OCLC #


Electronic OCLC #


Link to Catalog Record

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