Fundamental Assessment of Installation Configuration and Visual Range for a Guide-Light Delineation System
Guide-light delineation systems are designed to assume the role of pavement markings at night. The present report describes two fundamental studies of such systems: one on the effective installation interval conditions, and another on the visual range of such lights under wet road conditions and snow-covered road conditions. Visual range means distance that the drivers can see the illuminating area originated by the guide-light delineation system. To clarify the effective installation interval for the guide-light delineation system, an experiment was carried out using a driving simulator (DS). Five intervals of illuminated area which correspond approximately to the installation locations of the lamp post of the guide-light were proposed as the main independent variables. The DS experiment indicated that driver workload decreased with increases in the occupancy of the area illuminated by the guide-light delineation system. Next, the authors investigated the visual range of the illuminating area originated by the guide-light delineation system under actual road conditions. A guide-light delineation system equipped with green LED lamps was used to examine the visual range on a wet road and a snow-covered road. Luminance measurements were made under the three road surface conditions of dry, wet and snow-covered, which were chosen as the main independent variables. The field experiment indicated that the illuminating area originated by the guide-light delineation systems were able to indicate the road alignment more than 100m ahead. Based on these results, it might be concluded that the guide-light delineation system is extremely effective at reducing driver workload under various road alignments and provides sufficient visual range under poor visibility conditions at night.
-
Supplemental Notes:
- This paper was sponsored by TRB committee AND40 Standing Committee on Visibility.
-
Corporate Authors:
500 Fifth Street, NW
Washington, DC United States 20001 -
Authors:
- Hagiwara, Toru
- Sato, Hiroya
- Tomiyama, Kazuya
- Sueoka, Masami
- Sasaki, Shin
- Takagi, Issei
- Kunimura, Masao
-
Conference:
- Transportation Research Board 96th Annual Meeting
- Location: Washington DC, United States
- Date: 2017-1-8 to 2017-1-12
- Date: 2017
Language
- English
Media Info
- Media Type: Digital/other
- Features: Figures; Photos; References;
- Pagination: 19p
- Monograph Title: TRB 96th Annual Meeting Compendium of Papers
Subject/Index Terms
- TRT Terms: Lighting; Luminance; Night; Night visibility; Road markings; Weather conditions; Workload
- Subject Areas: Highways; Safety and Human Factors;
Filing Info
- Accession Number: 01625582
- Record Type: Publication
- Report/Paper Numbers: 17-02989
- Files: TRIS, TRB, ATRI
- Created Date: Feb 7 2017 9:47AM