AN IMPROVED INSTRUMENT FOR MEASUREMENT OF PAVEMENT MARKING REFLECTIVE PERFORMANCE
A PHOTOCELL DETECTOR IS DESCRIBED WHICH IS COLOR-CORRECTED TO CIE STANDARD OBSERVER RESPONSE, MAINTAINING INSTRUMENT RESOLUTION AT 0.1 DEGREES WITH DIRECT METER READING ELIMINATING SUBJECTIVE EFFECTS. AMBIENT DAYLIGHT EFFECTS ARE MINIMIZED BY USE OF SOURCE LIGHT INTERRUPTED AT A FREQUENCY ALSO REQUIRED FOR DETECTION. POWER IS SUPPLIED BY RECHARGEABLE DRY CELLS, PERMITTING CONVENIENT PORTABILITY. EXTENSIVE MEASUREMENTS OF VARIOUS RETRO- REFLECTIVE MATERIALS ON BOTH CONCRETE AND BITUMINOUS PAVEMENTS HAVE BEEN CONDUCTED, AND YIELD REPRODUCIBLE RESULTS HIGHLY CONSISTENT WITH VISUAL EXPERIENCE. MEASUREMENT OF EFFICIENT REFLECTIVE MATERIALS IS NOW POSSIBLE ALONG WITH INCREASED SENSITIVITY IN MEASUREMENT OF REFLECTIVE MARKING PAINTS.
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Supplemental Notes:
- 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.
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Authors:
- Harrington, Thomas L
- Johnson, McRae D
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Conference:
- 41st Annual Meeting of the Highway Research Board
- Location: Washington DC, United States
- Date: 1962-1-8 to 1962-1-12
- Publication Date: 1962
Media Info
- Media Type: Digital/other
- Features: Tables;
- Pagination: pp 111-113
- Monograph Title: Night visibility 1962
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Serial:
- Highway Research Board Bulletin
- Issue Number: 336
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Bituminous pavements; Concrete pavements; Electrolytic cells; Measurement; Performance; Photometers; Reflectorized paint; Road markings
- Old TRIS Terms: Dry cells; Traffic marking
- Subject Areas: Highways; Safety and Human Factors;
Filing Info
- Accession Number: 00220128
- Record Type: Publication
- Files: TRIS, TRB, ATRI
- Created Date: Jul 6 1970 12:00AM