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.
Evaluation of Experimental Tunnel Lighting in 30th Street Underpass on I-676 in Philadelphia
1975
83 pages
Report
No indication
English
Highway Engineering , Human Factors Engineering , Transportation & Traffic Planning , Underpasses , Illuminating , Performance evaluation , Street lighting , Environmental engineering , Human factors engineering , Experimental design , Sodium lamps , Comparative studies , Traffic flow , Vehicular tunnels , Urban transportation , Intensity , Adaptive systems , Automatic control , Recommendations , Braking , Pennsylvania , Data acquisition , Accidents , Velocity , Motor vehicle operators , Responses , Philadelphia(Pennsylvania) , DOT/GZ/GB , DOT/5H
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