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Research on Information Density Threshold of Urban Road Traffic Signs Based on Visual Comfort Evaluation
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  • Yunwei Meng,
  • Hui Hu,
  • * Feng,
  • Youzhang Yang,
  • Shibao Li,
  • Binbin Li,
  • Guangyan Qing
Yunwei Meng
Chongqing Jiaotong University School of Civil Engineering

Corresponding Author:[email protected]

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Hui Hu
Nanchang Industrial Holdings Group Co Ltd
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* Feng
Nanchang Industrial Holdings Group Co Ltd
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Youzhang Yang
Nanchang Industrial Holdings Group Co Ltd
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Shibao Li
Chongqing Jiaotong University School of Civil Engineering
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Binbin Li
Chongqing Jiaotong University School of Civil Engineering
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Guangyan Qing
Chongqing Zhixiang Paving Technology Engineering Co Ltd
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Abstract

The content and density of traffic signs directly affect the operation of urban road traffic and the acceptance of drivers. In order to make up the limitation of quantitative research on density threshold of traffic signs on urban roads, a real vehicle experiment was used to record the drivers’ psychophysiology characteristics. The psychological and physiological indexes of drivers, such as pupil area, fixation intensity, heart rate change rate and heart rate variability, were explored and then principal component analysis was used to present a new index S to represent driving visual comfort level, which was divided into 5 grade scales. The information entropy theory was applied to quantify the amount of information for road traffic signs in driving tests, and a regression relationship between the information content of traffic signs and the comfort index S was established. To meet the requirements of driving comfort, the visual psychophysiological load threshold was -2.289≤S<-1.526 for the level of very comfortable, 1.526≤S<-0.763 for the level of relatively comfortable, -0.763≤S≤0.763 for the level of comfortable, 0.763