The effects of dimmable road lighting: A comparison of measured and perceived visibility |
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| Affiliation: | 1. Aalto University, Department of Built Environment, Espoo, Finland;2. Aalto University, Department of Electrical Engineering and Automation, Espoo, Finland;1. EnCiclo Soluções Sustentáveis, Rua Lauro Linhares, n. 1284, Trindade, Florianópolis, SC, Brazil;2. Road safety consultant, Rua Silvia, n. 43, Bela Vista, São Paulo, SP, Brazil;3. Braskem S.A, Rua Lemos Monteiro, n. 120, Butantã, São Paulo, SP, Brazil;1. iDAPT Centre for Rehabilitation Research, Toronto Rehabilitation Institute – University Health Network, 550 University Ave, Toronto, ON M5G 2A2, Canada;2. University of Toronto Institute for Aerospace Studies, 4925 Dufferin St, Toronto, ON M3H 5T6, Canada;3. University of Toronto Department of Psychology, Canada;4. University of Technology Eindhoven, The Netherlands;5. International Development of Technology b.v., The Netherlands;1. Electrical Engineering Department, Jadavpur University, Kolkata, India;2. Electrical Engineering Department, Aliah University, Kolkata, India;3. TCS Research and Innovation, Kolkata, India;1. Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand;2. Faculty of Engineering, Rajamangala University of Technology Rattanakosin, Phutthamonthon Sai 5 Road, Salaya Phutthamonthon, Nakhon Pathom, 73170, Thailand |
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| Abstract: | By dimming road lighting, energy can be conserved without compromising traffic safety. This paper presents a study carried out on the effect of different lighting levels from road luminaires on drivers’ visual performance on a low traffic urban road. The small uniform target was used to evaluate the visibility performance of the drivers. The results obtained from subjective graded visibility were compared with contrast and the Adrian model. Results indicated a strong correlation between subjective graded visibility and contrast (R2 = 0.94) and a positive correlation between subjective graded visibility and the Adrian model (R2 = 0.88). Target’s location in relation to road luminaires had a considerable effect on its visibility. However, visibility is not a monotonic function of road lighting level. In the absence of glare from an oncoming car, 49% (3557 lm) of road lighting intensity provided better contrast and mean visibility than 100% (7252 lm) and 71% (5179 lm) of road lighting intensities. The glare from oncoming cars reduced visibility. However, no statistically significant effect of road lighting level on visibility under glare could be found. |
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| Keywords: | Night driving Visibility Road lighting intensities Car headlights Luminance contrast |
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