ILLUMINATION REQUIREMENTS FOR ROADWAY VISUAL TASKS
ILLUMINATION DATA ARE PRESENTED FOR TWO ROADWAY VISUAL TASKS: SEEING A MANNEQUIN AND A BLACK DOG AT VARIOUS DISTANCES DOWN THE ROADWAY WITH A VARIETY OF LUMINAIRE TYPES AND PAVEMENT SURFACES. ALL MEASUREMENTS WERE MADE UNDER AN ILLUMINATIVE GEOMETRY THAT IS REPRESENTATIVE OF GENERALLY ACCEPTED PRACTICE IN THE COUNTRY. DATA SUGGEST THAT: (1) 1.90 FT-CANDLES OF HORIZONTAL ILLUMINATION ARE REQUIRED FOR ADEQUATE VISIBILITY OF THE TARGETS WHEN THEY APPEAR IN THE DRIVING LANE 200 FT AHEAD, (2) 5.7 FT-CANDLES FOR THE SAME TARGETS TO BE ADEQUATELY VISIBLE AT THE SAME DISTANCE WHEN THEY APPEAR IN THE CURB LANE, (3) 9 FT-CANDLES IF THE TARGETS MUST BE SEEN 300 FT AHEAD, AND (4) 48 FT-CANDLES FOR 400-FT VISIBILITY IN THE DRIVING LANE. MOREOVER, THESE DATA REVEAL THAT THERE ARE VISUAL TASKS IN NIGHT DRIVING THAT ARE SO DIFFICULT THAT THEY REQUIRE INTERIOR LEVELS OF ILLUMINATION.
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Supplemental Notes:
- No 255, pp 117-127, 7 FIG, 5 TAB, 4 REF 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:
- Blackwell, H Richard
- PRITCHARD, B S
- Schwab, Richard N
- Publication Date: 1960
Media Info
- Monograph Title: Night visibility: 1960
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Serial:
- Highway Research Board Bulletin
- Issue Number: 255
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Illuminating engineering; Interior lighting; Light; Luminaires; Measurement; Pavements; Specifications; Visibility
- Uncontrolled Terms: Requirement
- Old TRIS Terms: Highway pavement; Illumination engineering; Visual classifications
- Subject Areas: Highways; Pavements; Safety and Human Factors;
Filing Info
- Accession Number: 00220241
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Aug 12 1994 12:00AM