Visibility of Laser Beams and Illuminated Delineator as Function of Fog Density

Hagiwara, Toru; Yagi, Mamiko; Seo, Takuya

doi:10.3141/1553-09

Transportation Research Record: Journal of the Transportation R

1996

DOI: 10.3141/1553-09

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Visibility of Laser Beams and Illuminated Delineator as Function of Fog Density

Toru Hagiwara¹,

Mamiko Yagi²,

Takuya Seo³

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2001

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“…The background luminance during snowstorms is very bright and affects the design of road delineators. Few studies have dealt with background luminance during snowstorms in the daytime, and more data are needed to improve road delineation in these low-visibility conditions (5,6). Similarly, few studies have been conducted to clarify how luminance of the illuminated delineator changes during daytime snowstorms (3).…”

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Target Luminance in Blowing Snow as a Function of Illuminance Conditions and Visual Range

Hagiwara

Kajiya

Akasaka³

et al. 2001

Transportation Research Record: Journal of the Transportation R

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In strong snowstorms, adequate visibility of road delineators provides the driver with important road geometry cues. Few data have been published on the luminance of targets in snowstorms. A model is proposed with which to determine the luminance of an illuminated delineator and the background luminance in snowstorms. An experiment was performed over 30 days in the Ishikari district in Hokkaido, Japan, in 1997. Luminance, illuminance, and transmissivity in snowstorms were simultaneously recorded by a data-recording system at intervals of 10 min. The observation distance was set at 34 m, and snow on the ground was used as the background. The recorded data indicated that the background luminance in snowstorms was affected by illuminance and transmissivity. A multiple regression equation was applied to the model to determine the background luminance. A black board and an illuminated delineator were used as visual targets at the test site. The data indicated that these luminances could be estimated by the multiple regression equation. Differences of the illuminated delineator and the black board in luminance were calculated from these models if the visual range, the observation distance, and the illuminance were given. For example, at a visual range of 200 m, an illuminance of 5000 lx, and an observation distance of 100 m, contrast of the black board was five times greater than that of the illuminated delineator. The results of the study showed that the illuminated delineator indicated good visibility during snowstorms in dark conditions, whereas the black board had a better visibility than the illuminated delineator during snowstorms in the daytime. An illuminated delineator should be located close to the driver to reduce the required luminous intensity. In addition, road delineators should be arranged at short intervals. The data from this study can be used to design and evaluate improved devices of road delineators on highways during snowstorms.

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mentioning

confidence: 99%

Target Luminance in Blowing Snow as a Function of Illuminance Conditions and Visual Range

Hagiwara

Kajiya

Akasaka³

et al. 2001

Transportation Research Record: Journal of the Transportation R

Self Cite

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Visibility of Laser Beams and Illuminated Delineator as Function of Fog Density

Cited by 1 publication

References 0 publications

Target Luminance in Blowing Snow as a Function of Illuminance Conditions and Visual Range

Target Luminance in Blowing Snow as a Function of Illuminance Conditions and Visual Range

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