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The purpose of this specification is to provide the minimum performance requirements for the LED “walking person” and “upraised hand” icons and numeric countdown pedestrian signal modules (hereafter called module or modules). This specification includes the following three sizes (nominal message bearing surface): 406 mm x 457 mm (16 in. x 18 in.), 305 mm x 305 mm (12 in. x 12 in.), and 229 mm x 229 mm (9 in. x 9 in.). This specification is not intended to impose restrictions upon specific designs and materials that conform to the purpose and the intent of this specification. This specification refers to definitions and practices described in Pedestrian Traffic Control Signal Indications published in the Equipment and Materials Standards of the Institute of Transportation Engineers, referred to in this document as “PTCSI.” This specification is not restricted to any specific LED technology.