SHIELDING SIGNAL INDICATIONS
MANY VARIETIES OF VISORS OR HOODS ARE SEEN MOUNTED ON TRAFFIC SIGNALS WHICH ATTEMPT TO SHIELD THE SIGNAL INDICATION FROM CROSS TRAFFIC. HOWEVER, THERE SEEMS TO BE NO STANDARD VISOR CONFIGURATION IN USE. TRAFFIC AND SAFETY OFFICIALS, WHEN QUESTIONED ABOUT THE PURPOSE OF HOODS, GENERALLY AGREE THAT THEY ARE TO DIRECTIONALIZE THE LIGHTS SO THAT ONLY RIGHT-OF-WAY TRAFFIC IS AFFECTED. THE PROVISIONS OF THE UNIFORM TRAFFIC CONTROL DEVICES MANUAL ARE QUOTED ON PAINTING AND VISIBILITY AND SHIELDING OF LENS. RECENTLY, A PATENT WAS ISSUED TO THE AUTHOR COVERING A TRAFFIC LIGHT SHROUD WHICH PREVENTS INTERNAL TUBE REFLECTIONS FROM REFLECTING OUTWARDLY. THIS IS ACCOMPLISHED BY THE ADDITION OF INWARDLY PROJECTING FRUSTOCONICAL BAFFLES SO PLACED THAT EACH BAFFLE IS IN THE SHADOW OF ANOTHER. BAFFLE ANGLES HAVE BEEN SCIENTIFICALLY ARRANGED SO THAT ALL STRAY REFLECTED LIGHT IS CANCELLED OUT, AND THUS THE ONLY LIGHT TO BE EMITTED FROM THE TUBE IS THAT WHICH IS DIRECTLY IN ALIGNMENT WITH THE LENS. PRELIMINARY ENGINEERING INVESTIGATIONS INDICATE THAT INJECTION MOLDED PLASTIC INSERTS MAY BE THE MOST INEXPENSIVE AND PRACTICAL WAY TO EQUIP SIGNAL LIGHTS WHICH PRESENTLY USE HOODS. PROVISIONS HAVE BEEN MADE TO MAKE THE INSERTS IN SECTIONS TO ACCOMMODATE TUBES OF VARYING LENGTHS AND GLARE RESTRICTIVE ABILITIES.
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Supplemental Notes:
- Vol 32, No 4, P 13, 2 FIG
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Authors:
- Staats, H N
- Publication Date: 1967-7
Media Info
- Serial:
Subject/Index Terms
- TRT Terms: Constrictions; Glare; Injection molding; Plastics; Reflection; Traffic control devices; Traffic signals; Visibility
- Uncontrolled Terms: Baffles; Shielding
- Subject Areas: Highways; Operations and Traffic Management;
Filing Info
- Accession Number: 00225162
- Record Type: Publication
- Files: TRIS
- Created Date: Jan 16 1994 12:00AM