Specifications include, but are not limited to: 1. Beacon Dimensions and Placement in Sign Assembly: a. Each rectangular rapid flashing beacon (RRFB) shall consist of two rectangular-shaped yellow indications, each with an LED-array based light source. Each RRFB indication shall be a minimum of approximately 5 inches wide by approximately 2 inches high. b. The two RRFB indications shall be aligned horizontally, with the longer dimension horizontal and with a minimum space between the two indications of approximately seven inches (7 in), measured from inside edge of one indication to inside edge of the other indication. c. The outside edges of the RRFB indications, including any housings, shall not project beyond the outside edges of the W11-2.
