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7~ <br /> <br /> <br />^ ai: ~: ~® <br />~' <br />Electronic message center displays <br />are commonly used in sports arenas <br />and otherpublic facilities because of <br />their versatility, exceptional visibility <br />in virtually all weather conditions, <br />advertising versatility, and attractive <br />and crowd-pleasing visual quality <br /> <br />sources to produce images and text. These light sources <br />may include: <br />• LightEmittingDiode(LED)-ThistypeofEMC <br />has a matrix of LEDs. LED electronic sign <br />displays provide good resolution, are energy- <br />efficient, and are long-lasting. LED technology, <br />first developed in the 1990s, has continued to <br />improve, increasing ]fight output and reducing <br />LED degradation, thus extending the life of the <br />LED light source. <br />• Incandescent lamps -This type of EMC uses a <br />matrix of incandescent bulbs. Its messages can <br />easily be seen and read across a wide viewing <br />range and often for a long distance. Multicolored <br />displays can be created by clustering several <br />different colored bulbs together to create pixels, <br />which are then mounted on panels. Incandescent <br />lamp screens aze bright and suitable for operation <br />in direct sunlight. <br />• Wedge-based low voltage lamp -This type of <br />message center consists of small diameter light <br />bulbs with awedge-shaped base inserted into. <br />parabolic reflectors similaz to those found in an <br />automobile taillight. Several bulbs may then be <br />covered with different colored tenses and <br />arranged into pixels. The result is a very bright <br />display that works well in direct sunlight. Like <br />most camp displays, it offers a wide viewing <br />range. <br />• Fluorescent Discs - Aiso known as "flip disc" <br />or "split flap," this technology uses <br />electromagnets to mechanically turn or "flip" <br />discs mounted on pivots in a specific sequence <br />to reveal the reflective material, forming letters <br />l~h <br />~~ ~ <br />gi ~;~ S; <br />n <br />or numbers. Depending on ambient lighting, the <br />signs can take advantage of sunlight or hidden <br />fluorescent light bulbs to illuminate reflective <br />material on each disc, or pixel. <br />Cathode Ray Tubes (CRTs) -These signs are <br />virtual television screens, with CRTs mounted <br />in arrays. They are ufilized in very large, expensive <br />message centers to produce full color images, and <br />aze commonly featured in sports arenas. <br />Safety <br />Electronic message centers are not a distraction to <br />drivers; in fact, it is quite the contrary. Their exceptional <br />readability and conspicuity means that EMCs actually <br />increase driver safety. The federal government <br />recognizes the superior communication value of EMCs <br />and uses electronic information panels on many freeways <br />to warn drivers of possible hazards. Its use of portable <br />electronic warning signs at construction or accident sites <br />is also increasing. Airports and state highway <br />departments are also developing expertise in positioning <br />and sizing of these signs to enable the driver to read, <br />reactandmovethroughtrafficwithoptimumsafety. The <br />federal government attd outer reviewers, after conducting <br />numerous studies, analyzing court cases, and reviewing <br />the available literature, have concluded that signs and <br />electronic message centers, if used properly, are traffic <br />safety enhancement devices. <br />Vaziable message signs, whose content can be changed <br />or altered on a fixed display surface, are recognized by <br />the federal government as different from the regulated <br />-l signline 40.pmtl ~ ~ <br />12 3I13I2003, 1245 PM <br />r <br />'~~___ <br /> <br /> <br />