| Summary: | 碩士 === 佛光大學 === 產品與媒體設計學系 === 107 === Light-emitting diode, abbreviated LED, industry has already proven itself to be highly-developed industry with huge potential in respect to its ever-growing market share. It is hard that you don’t live without getting the great benefits LED brings. LED is ubiquitous in the sense that it finds itself to be widely applied and deployed over the places such as daily household environment, public spaces, recreational areas, and traffic infrastructures.
Realizing that the devotions to the researches on the vision technology in terms of human factors are rare, we, in this thesis, conducted experiments, and studied to what extent the influences of the different parameters of LED-type speed limit signs to human sensations in different groups can be varied and make differences. Currently, the speed limit signs on the most of roads and streets in Taiwan are of reflective type. The degradation of visibility of reflective speed limit signs can be expected and observed under certain ambient or disturbing conditions, lowly illuminated environment or sign contamination, etc, and that shed some concerns on the traffic safety. To LED type of speed limit signs utilized in Taiwan, their brightness and illumination frequencies are usually set fixed. In our humble opinion, these two parameters should be carefully adapted with respect to different groups of people, i.e., the two parameters for different groups of people have to be tailored specifically in order to cope with different conditions, and to satisfy their very specific needs.
The research in the thesis was conducted by asking two different groups of people in early adulthood (20-40) and late adulthood (over 60) to finish several designed questions under the form of questionnaire. We collected the information, and objectively made studies through statistical and analytical methods. In the end, we found one of the most suitable set of parameters of LED illumination intensity and frequencies for different groups of people considered in this thesis. We hope that this thesis can make practical contributions to traffic sign design and literally bring better traffic safety to all riders and drivers.
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