EVALUATION OF A FIELD TESTING DEVICE FOR FLASHING BARRICADE WARNING LIGHTS
The evaluation of the device (constructed to measure the effective intensity (candelas), flash time (milliseconds), and period (seconds) of flashing lights in the field) consisted of a direct correlation between values obtained for the parameters measured by means of the device and optical tunnel facilities. Variables under investigation were different light manufacturers, variable light power levels, and different viewing angles. Tests showed that after careful optical alignment to a type A light powered with a voltage to cause a failing light (less than 4.0 cd at +/-9 deg horizontal, +/-5 deg vertical) the test device will read within +/-10 percent of the value currently obtainable with the optical tunnel instruments. Of the +/-0.4-cd deviation, about one-third or +/-0.12 cd can be statistically attributed to the use of regression analysis techniques; the remaining two-thirds (+/-0.28 cd) is due to measurement error, reading error, or other experimental errors. The test results justify use of the device as a laboratory testing instrument.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/isbn/0309025672
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Supplemental Notes:
- A Final Report of this project performed by the Pennsylvania Department of Transmportation and Federal Highway Administration is available from NTIS, PB-245010/4ST. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved. Publication of this paper sponsored by Committee on Maintenance Operations.
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Authors:
- Klotz, Robert C
- Publication Date: 1976
Media Info
- Media Type: Print
- Features: Figures;
- Pagination: pp 45-46
- Monograph Title: Maintenance management, the federal role, unionization, pavement maintenance, and ice control
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Serial:
- Transportation Research Record
- Issue Number: 598
- Publisher: Transportation Research Board
- ISSN: 0361-1981
Subject/Index Terms
- TRT Terms: Accuracy; Barricades; Field tests; Flashing traffic signals; Laboratory tests; Regression analysis; Testing equipment; Warning systems
- Subject Areas: Data and Information Technology; Highways; Maintenance and Preservation; Safety and Human Factors;
Filing Info
- Accession Number: 00156286
- Record Type: Publication
- ISBN: 0309025672
- Files: TRIS, TRB
- Created Date: Jul 19 1977 12:00AM