Roadway Lighting: Illumination Study of Rte. I-95, Shirley Highway

Report No: 77-R4

Published in 1976

About the report:

This report is concerned with a study of the quantity and uniformity of the illumination on some selected sections of the roadway lighting on Rte. I-95 in Northern Virginia. The evaluation of the lighting was made to obtain data that could be used as a guide for the selection and design of future lighting systems or for possible modification of existing systems. The illumination data were collected with a photometric recording system that was developed specifically for the study. This equipment, which is described in the report, is mounted in a vehicle such that data can be recorded while driving through the area being surveyed. These data were used to develop isofoot-candle diagrams which show the distribution of the illumination over the roadway area. In addition, average illumination levels and uniformity determinations were calculated from these data, The results indicated that the main line lighting on Rte. I-95 was excellent and was generally well within the recommended design standards for uniformity and average maintained levels of illumination. The uniformity of the lighting on the loop type ramps having the lamp posts located on the inside of curvature was generally not good - although better on some ramps than on others. These and other inadequacies of the system are discussed in the report.

Disclaimer Statement:The contents of this report reflect the views of the author(s), who is responsible for the facts and the accuracy of the data presented herein. The contents do not necessarily reflect the official views or policies of the Virginia Department of Transportation, the Commonwealth Transportation Board, or the Federal Highway Administration. This report does not constitute a standard, specification, or regulation. Any inclusion of manufacturer names, trade names, or trademarks is for identification purposes only and is not to be considered an endorsement.

Authors

Other Authors

Marvin H. Hilton

Last updated: January 28, 2024

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