An experimental lighting system was installed in the underpass on I676 in Philadelphia. The lighting system was designed to provide 5 levels of illumination ranging from 500 fc horizontal down to 2 fc horizontal. Low pressure sodium vapor lamps were used for the illumination. The internal level was automatically set by a series of photocells external to the underpass and automatically provided a ratio of internal to external luminance of approximately 10%. The objective of the research was to determine the effect of the improved illumination on traffic operations. Four measures were employed: (1) effect on traffic accidents, (2) effect on vehicle velocity maintenance, (3) effect on deceleration characteristics (i.e., braking) and (4) effect on drivers' subjective responses to the new lighting.


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