00156286

Component

http://onlinepubs.trb.org...s/trr/1976/598/598-011.pdf

https://scholar.google.co...lotz&publication_year=1976

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.

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.

01414349

pp 45-46

1976

Transportation Research Record

0309025672

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Figures (1)

Accuracy; Barricades; Field tests; Flashing traffic signals; Laboratory tests; Regression analysis; Testing equipment; Warning systems

Data and Information Technology; Highways; Maintenance and Preservation; Safety and Human Factors

TRIS, TRB

Jul 19 1977 12:00AM

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