Traffic management and road safety may benefit from self-powered LED road studs but to be effective they need to be visible to road users, without glare, whatever the environmental conditions. Some parameters, such as dry versus wet road surfaces, have not been investigated previously for LED installations. In this context, two experiments have been conducted to study the visibility and discomfort glare produced by a LED road stud. The results suggest tuning the luminous intensity of LED road studs according to the illumination and road surface conditions to ensure visual perception by road users while controlling energy consumption. A quantitative model is provided in order to link the dimming to the environmental parameters.
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References
1.
MillsA. Lighting: The progress and promise of LEDs. III-Vs Review2004; 17(4): 39–41.
2.
MassolL. Les LED pour l'Eclairage : Fonctionnement et Performances, Paris, France: Editions Dunod, 2012.
Commission Internationale de l'Eclairage Review of Lighting Quality Measures for Interior Lighting with LED Lighting Systems. CIE Publication 205:2013, Vienna: CIE, 2013.
5.
ZalewskiS. A proposed method for the calculation of light emitting diode road lighting. Lighting Research and Technology2012; 44(2): 186–196.
6.
SweaterHKNarendranNBulloughJDFreyssinierJP. Effect of different coloured luminous surrounds on LED discomfort glare perception. Lighting Research and Technology2013; 45(4): 464–475.
7.
HalonenLPuolakkaM. The use of LEDs and applications of the new mesopic design in road lighting: Proceedings on Solid-State and Organic Lighting SOWC2, Karlsruhe, Germany, 2010. June 21–24, 2010.
8.
JuntunenETetriETapaninenOYrjänäSKondratyevVSitomaniemiASiirtolaHSarjanojaEMAikioJHeikkinenV. A smart LED luminaire for energy savings in pedestrian road lighting. Lighting Research and Technology2013. DOI: 10.1177/1477153513510015.
9.
ZhuXDemirdesHGongXLaiJHeynderickxI. The luminaire beam-shape influence on discomfort glare for led road lighting: Proceedings on MidTerm CIEParis, France, April 15–16: 2013, 331–339.
10.
BoysJTGreenAW. Intelligent road-studs – lighting the paths of the future. Transactions of the Institution of Professional Engineers New Zealand: General Section1997; 24(1): 33–40.
11.
ShaharABrémondR. Toward smart active road studs for lane delineation: Proceedings in Transport Research ArenaParis, France, April 14–17: 2014.
12.
ReedN. Driver Behaviour in Response to Actively Illuminated Road Studs: A Simulator Study, Published Project Report, Crowthorne, UK: Transportation Research Laboratory, 2006.
13.
DesireeLLDer PoelV. Dynamic Road Marking System and Road Segment Provided with Said System2006. Patent US7021857 B2.
14.
BoysJTGreenAW. Intelligent road-studs – lighting the paths of the future. Proceedings of Engineering IPENZ Annual Conference, Wellington New Zealand: Feb 9–13, 1996, pp. 169–176.
TheeuwesJAlferdinckJWAMPerelM. Relation between glare and driving performance. Human Factors2002; 44(1): 95–107.
17.
BulloughJDBronsJAQiRReaMS. Predicting discomfort glare from outdoor lighting installations. Lighting Research and Technology2008; 40(3): 225–242.
18.
WuCFLiouJJLinJL. Evaluation of visual performance using LED signboards under different ambient conditions. Procedia Engineering2012; 29: 975–980.
19.
MunehiroKAsanoMTokunagaRAHagiwaraT. Required luminous intensity of led roadway delineators under foggy conditions. Journal of the Eastern Asia Society for Transportation Studies2007; 7: 1987–2002.
20.
BacelarA. Definition of a luminous stud to improve the legibility of expressway for drivers. Journal of Light and Visual Environment2004; 28(3): 148–151.
BoydJPercyDLambton KWilsonAJ. The evaluation of dynamic road marking for white line replication: Proceedings of the 13th ITS World CongressLondon, Oct 8–12: 2006.
23.
GibbonsRBHankeyJPashajI. Wet Night Visibility of Pavement Markings: Executive Summary. Report, VTRC final contract report, Virginia: VTTI, 2004.
24.
FlynnJEHendrixCSpencerTMartyniukO. A guide to methodology procedures for measuring subjective impressions in lighting. Journal of the Illuminating Engineering Society1979; 8(2): 95–110.
RakotomalalaR. Pratique de la regression logistique: Regression logistique binaire et polytomique. Document de travail, Université Lumière Lyon 2, Laboratoire ERIC, 2013, pp. 258.
28.
HosmerDWLemeshowS. Applied Logistic Regression, 2nd. New York, NY: Wiley, 2000.
29.
Recommendations Relatives à l'Eclairage des Voies Publiques, Paris, France: Edition Lux, 2002.
30.
De BoerJB. Visual perception in road traffic and the field of vision of the motorist. In: Public Lighting, Eindhoven, Netherlands: Philips Technical Library, 1967. pp.11–96.
31.
SivakMFlannaganMJTraubeECKojimaS. The influence of stimulus duration on discomfort glare for persons with and without visual correction. Transportation Human Factors1999; 1(2): 147–158.
32.
BulloughJDVan DerlofskeJDeePChenJAkashiY. An Investigation of Headlamp Glare: Intensity, Spectrum and Size, Technical Report. Task 4 Final Report, Troy, NY: Lighting Research Center, Rensselaer Polytechnic Institute, 2003.
33.
Schmidt-ClausenHBindelsJ. Assessment of discomfort glare in motor vehicle lighting. Lighting Research and Technology1974; 6(2): 79–88.
34.
WandellB. Foundations of Vision, Sunderland, MA: Sinauer, 1995.
35.
MoisioOPajulaMPinhoPTetriEHalonenLSepponenR. Use of junction temperature in control of CCT in LED luminaire: Proceedings of the CIE Midterm Meeting, Léon, Spain, 2005328–334.
36.
MuellerG. Electroluminescence I, London, UK: Academic Press, 2000.
37.
MuthuSSchuurmansFJPPashleyM. Red, green and blue LEDs for white light illumination. IEEE Journal of Selected Topics in Quantum Electronics2002; 8(2): 333–338.
