近年來高輝度發光二極體LED 於技術上有很大的突破，不僅在燈具，LED光源也廣泛使用在交通標誌方面。使LED光源的應用得以發揚光大，由於目前臺灣在LED交通標誌管制方面並無有效規範與標準，在大量且泛濫的使用下，可能影響用路人在夜間的駕駛狀況，甚至會有光汙染的問題。所以本研究將對LED內嵌式標誌的清楚與眩光感受做研究，經由人因實驗得到數據，並提出建議方法。
初期藉由LED內嵌式標誌之人因實驗，操控變項包含LED光源大小、LED光源間距、不同字體的複雜度與光源輝度，其中輝度規範為參考北美照明協會與經濟部能源局建議之規範20~500 cd/m2，藉此得到影響辨識度之主要因子。後續根據初步結果與國道高速公路中使用LED內嵌式標誌之LED光源大小和LED光源間距，進行更深入之探討，並藉由清楚與眩光主觀感受評價之問卷，得到受測者在不同的光源大小與光源間距的組合下之評價，並根據其分析結果提出LED內嵌式標誌之單一顆LED輝度建議應在100~300 cd/m2。
最後本研究提出評價分數之相關公式，其公式與密度和輝度有所關係，並定義若清楚分數超過5分代表清楚，眩光分數超過5分為有眩光。該結論可以得知未來可以用在LED標誌當做參考依據，並有效提高用路人得到正確道路資訊。

In recent years, the technology of high-luminance light-emitting diode (LED) has a great breakthrough. LED has been used in lighting applications, but also widely ap-plied in traffic signs, so that the applications of LED light source can be carried for-ward. Nowadays, the standards of the LED traffic sign control in Taiwan is still not well-defined, the growing of LED lighting abuse may affect the passers-by, driving conditions, and light pollution at night. Therefore, this study had investigated in clar-ity and perception of glare with a LED embedded traffic mark by the data of psycho-physical experiment and proposed recommendations methods.
To obtain the main factors affecting the clarity in the preliminary experiment, control variables included the size of the LED light source, LED light source spacing and complexity and luminance with different fonts. The reference luminance specifi-cation of Illuminating Engineering Society of North America and Bureau of Energy, Ministry of Economic Affairs were followed in this research, so the luminance of LED light source is set to 20 ~ 500 cd/m2.
According to the preliminary results, the further discussion and comparison with LED embedded traffic mark used in the national highways was mentioned. Besides, by the evaluation of subjective feelings of clarity and perception of glare, we obtained the combination of different sizes and spacing of the LED light source. Thus, the lu-minance of single LED light source for LED embedded traffic mark was suggested to redefine as 100~300 cd/m2 according to the analysis results.
Finally, this study presents the related formula of evaluation score, and the for-mula is related with density and luminance. The definition of clear is as follow: if the clarity score is more than five points, then means observer felt clear, and likewise, when the score of perception of glare more than five points, it means observer has feeling glare. The conclusion can be used as a reference in LED signs in the future.

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