Determining minimum visibility levels in different road lighting scenarios

B. Buyukkinaci*, S. Onaygil, O. Guler, M. B. Yurtseven

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

This study investigates visibility levels for different road lighting scenarios. Four different road lighting classes (M2, M3, M4, M5), two different colour temperature luminaires (4000 K and 6000 K) and four different critical object reflectances (0.20, 0.30, 0.40, 0.50) were used to determine the effects of lighting classes and colour temperatures on the critical object detection. In total, 1920 photographs were taken on a test road and visibility levels were calculated for each case. From these 1920 visibility levels, photographs corresponding to 245 visibility level values ranging from 1 to 9 were selected and evaluated by 30 subjects aged between 25 and 35 years in a laboratory environment. As a result of the study, it was shown that visibility levels are between 7.0 and 8.5 for road lighting classes ranging from M2 to M5, illuminated by light sources with different colour temperatures, for 100% detection of critical objects. This result is in line with the suggested VL values changing between 7 and 10 in the literature.

Original languageEnglish
Pages (from-to)1045-1056
Number of pages12
JournalLighting Research and Technology
Volume50
Issue number7
DOIs
Publication statusPublished - 1 Nov 2018

Bibliographical note

Publisher Copyright:
© The Chartered Institution of Building Services Engineers 2017.

Funding

The authors disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: The authors would like to thank to Ministry of Science Industry and Technology and ISBAK Istanbul IT and Smart City Technologies Inc. for funding the Istanbul Technical University within the scope of San-Tez 0660.STZ.2014 project.

FundersFunder number
Istanbul Technical University
Ministry of Science Industry and Technology and ISBAK Istanbul IT and Smart City Technologies Inc

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