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Citation
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Mehri A, Farhang Dehghan S, Hajizadeh R, Zakerian SA, Mohammadi H, Abbasi M. Traffic Injury Prev. 2017; 18(7): 711-715. |
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Affiliation
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Department of Occupational Health , School of Public Health, Tehran University of Medical Sciences, Tehran, Iran and Research Center for Environmental Determinants of Health (RCEDH), Kermanshah University of Medical Sciences , Kermanshah , Iran .. Email: milad8285@gmail.com. |
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Abstract
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OBJECTIVE: In two-lane roads, a discomfort glare can cause annoyance, discomfort and inconvenience, stress and fatigue to drivers on the front line. This can cause accidents. The aim of this study is to evaluate the discomfort glare from the headlamps of cars widely used in Iran.
METHODS: The discomfort glare of new vehicles including Pride Saba model GTX, Pride Model 131SL, Samand Soren, Peugeot 405, Megan, and Peugeot Pars was examined at distances of 5 to 100 metres and in background luminance of 50 cd/m(2) (late twilight / early dawn lighting) and 1 cd/m(2) (night time) by Schmidt-Clausen and Bindels model and de Boer subjective scale.
RESULTS: According to the de Boer scale, in the background luminance of 50 cd/m(2), the discomfort glare on all studied vehicles was between 1.98 and 4.05 in the high-beam mode and between 3.5 and 5.4 in the low-beam mode. In the background luminance of 1 cd/m(2), the discomfort glare was between 0.41 and 2.48 in the high-beam mode and between 1.93 and 3.84 in the low-beam mode. In the high-beam mode, the average levels of discomfort glare of these vehicles gradually increased when the distance between cars was reduced by up to about 20 metres. In the low-beam mode, there was no discomfort glare up to a vehicle distance of 40 metres. Also, at an angle of 1.15 to 5.73° between the line of sight and light of vehicles in the high-beam mode, the level of discomfort glare was increased, but, at an angle of 5.73-22.9° the level of discomfort glare was reduced. In the low-beam mode at an angle of 2.86-22.9° the level of discomfort glare was almost identical. The results show that in the high-beam mode and in the 100-metre distance between the vehicles, as well as in the low-beam mode at intervals of less than 40 metres between cars discomfort glare is created.
CONCLUSION: It can be concluded that by providing solutions such as installing road lighting system, an increase in luminance of roads, separating or widening road lanes, and increasing the lateral distance between vehicles, increasing the angle between the light vehicles and the drivers can noticeably reduce discomfort glare.
Language: en |