CONTACT US: Contact info
|
Citation |
Zimmer RA. Transp. Res. Rec. 1988; 1172: 68-73. |
|
Copyright |
(Copyright © 1988, Transportation Research Board, National Research Council, National Academy of Sciences USA, Publisher SAGE Publishing) |
|
DOI |
unavailable |
PMID |
unavailable |
|
Abstract |
State and local transportation agencies have responsibility for the design, construction, and inspection of high-mast roadway lighting projects, using prescribed guidelines. These guidelines require many measurements of the illuminance levels of highway lighting installations to determine whether the installations achieve the desired design goals, to determine whether manufacture specifications are met, and to document long-term aging effects. The state of the art in photometry, or the measurement of light visible to the human eye, has been developed to a very high degree of accuracy and reliability by commercial manufacturers of photometric instruments. One large drawback to these instruments in highway work is that the readings are normally taken by an operator carrying the instrument to the location to be measured and hand-recording the value. This approach is very time consuming and dangerous as well, if readings are required from a busy, in-service roadway. This study has resulted in the development of a simple, cost-effective, and easily assembled illuminance measurement system to evaluate high-mast (80-180-ft) roadway lighting systems from a passenger vehicle traveling at traffic speeds. The system provides readings, in footcandles, at fixed distance intervals as short as 15 ft. The measurements are then recorded on a computer disk for later analysis. The printed analysis provides a footcandle value for each traffic lane at each distance interval and a calculation of the maximum, minimum, average, and uniformity ratio. The system is assembled from commercially available units with a minimal amount of construction, resulting in easy implementation. Language: en |
|
Keywords |
Photometry; Street Lighting; Electric Lighting--Outdoor; Highway Systems--Electric Lighting; Illuminating Engineering--Computer Applications; Light--Measurements |