Traffic signs play important roles in traffic, providing road users with regulatory, warning, and guide information about road conditions ahead. According to LEDSigns, the Taiwan-based company established by HONYEE Group in 2009 to concentrate on the development of LED [light emitting diode] signs, visibility and legibility of traffic signs can have a great influence on a driver's ability to comprehend a sign's messages and response time: "it is critical their brightness is enhanced at night and in bad weat