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Research on the Measurement Methodson Light Environment of Intersection Lighting

Author: LiuChang
Tutor: WangLiXiong
School: Tianjin University
Course: Building Science,
Keywords: Intersection lighting Measurement methods TI Selection basis ofmeasurement points Evaluation
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Type: Master's thesis
Year: 2012
Downloads: 6
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Abstract


As an important part of night lighting environment, the quality of city intersection lighting is significant for protecting the traffic safety in the night, improving the efficiency of transportation and providing a good visual environment for the drivers.The existing road lighting test methods are crossing lines and arranging points.We used luminance meter and illuminometer to obtain the optical parameters of the measuring point, or used vehicle equipment instead of manual measurement, which can reduce the risk of measurement, and improve the efficiency.New measuring method is extracting optical parameters information mainly through the digital image, which greatly simplifies the measurement procedure. Compared the pros and cons of different methods,we could see that the lighting measurement methods suitable for the intersection were the traditional method and digital image extraction method.Analyzed the existing road lighting quality evaluation standard,we could get the evaluation of intersection.Combined with the characteristics of intersection and the visual characteristics of the driver,we found that the best suitable standard of intersection lighting safety evaluation is the threshold increment(TI).Taking TI as the research object,we did mathematical arguments and the actual analysis for measurement point selection and got the selection basis theoretically.We did actual measurements of typical eight intersections in Tianjin with both conventional methods and digital image extraction methods.According to data processing,we got the corresponding measuring point TI value.We compared the adaptability and feasibility of the two methods. In addition,through the comparison of the data,we analyzed the limitations of traditional methods in the the intersection lighting measurement and the reasons for measurement error, and summed up that the digital image extraction method was the the suitable lighting measurement method for the intersections.Though comparing the calculated TI value and the actual visual environment of the measurement point,combined with the subjective evaluation,we gave the discussion space for the adaptability of TI for the intersection lighting safety evaluation. We expected some new evaluations could be put forward.

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