ELEMENTS OF ROADWAY LIGHTING - PART 2
TABLES OF RECOMMENDED ILLUMINATION VALUES ARE PRESENTED FOR AVERAGE HORIZONTAL FOOTCANDLES FOR TYPICAL RESIDENTIAL APPLICATIONS, TYPICAL COLLECTOR STREET OR OUTLYING MAJOR STREET APPLICATIONS, TYPICAL MAJOR STREET APPLICATIONS AND FREEWAY APPLICATIONS, GIVING BRACKET LENGTHS, POLE SETBACKS, MOUNTING HEIGHTS, LUMINAIRE TYPES, LAMP SIZES, AND NUMBER OF LANES. MEASURES OF ILLUMINATION REQUIREMENTS ARE THE TYPE OF LAND USE AND THE TYPE AND CHARACTER OF TRAFFIC FLOW. THESE ELEMENTS MUST BE CONSIDERED BY A ROADWAY CLASSIFICATION SYSTEM. AN EXAMPLE IS GIVEN OF LOW LEVEL LIGHTING WHICH IS PROVING EFFECTIVE ON THE SAN MATEO BRIDGE ACROSS THE SAN FRANCISCO BAY. THIS CARPET LIGHTING EFFECT IS SAID TO BE THAT OF DRIVING ON A LUMINOUS ROAD OF ALMOST GLARELESS LIGHT, PRODUCING A SHARP DELINEATION OF CURBS, ROAD MARKING AND OBJECTS IN THE ROADWAY. TESTS ON THIS SYSTEM INDICATE THAT IT IS PARTICULARLY VALUABLE UNDER ADVERSE VISIBILITY CONDITIONS, AT WHICH TIMES A HIGHER DEGREE OF ILLUMINATION MAY BE USED.
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Supplemental Notes:
- Vol 32, No 3, PP 16-19, 5 TAB, 2 PHOT
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Authors:
- Box, P C
- Publication Date: 1967-5
Media Info
- Serial:
Subject/Index Terms
- TRT Terms: Freeways; Height; Illuminating engineering; Lamps; Land use; Lighting equipment; Luminaires; Street lighting; Streets; Tables (Data); Traffic flow; Traffic lanes
- Old TRIS Terms: Collector distributor roads; Freeway lighting; Illumination engineering; Mounting
- Subject Areas: Highways; Safety and Human Factors;
Filing Info
- Accession Number: 00219941
- Record Type: Publication
- Files: TRIS
- Created Date: Feb 6 1994 12:00AM