An optical warning device comprising an array of multiple light heads for a vehicle having a primary Controller Area Network, CAN, serial data bus (108, 204) to carry first serial communications among spaced-apart CAN nodes (112, 118, 130, 136, 140, 154, 220, 260, 288) communicatively coupled thereto, the first serial communications for initiating a light flash sequence from the array, comprising: a secondary CAN serial data bus for establishing a nested CAN serial data bus (180, 190, 200, 238) carrying, in response to the first serial communications, second serial communications provided to the multiple light heads communicatively coupled thereto, the second serial communications for controlling the light flash sequence from the array; each of the multiple light heads including light head CAN node circuitry, the light head CAN node circuitry including a light head CAN controller electrically coupled to the secondary CAN serial data bus such that an impedance of the light head CAN node circuitry is electrically isolated from the primary CAN serial data bus when an associated light head is operatively deployed in the vehicle; and an array controller (130, 136, 140, 220, 260) including first and second CAN node circuitry configured to communicatively segregate and bridge the primary and secondary CAN serial data buses, the first CAN node circuitry including a first CAN controller electrically couplable to the primary CAN serial data bus so as to establish a first CAN node for facilitating the first serial communications, and the second CAN node circuitry including a second CAN controller electrically coupled to the secondary CAN serial data bus so as to establish a second CAN node for facilitating the second serial communications, wherein the array is: a) a light bar mountable atop a roof of the vehicle; b) a safety director mountable atop of the vehicle and arranged to provide a rearward-facing flash pattern; c) mountable to a rear visor of the vehicle; d) a rear-windshield mountable array arranged to provide a rearward-facing flash pattern; or e) a front-windshield mountable array arranged proximal a visor to provide a frontward-facing flash pattern. a secondary CAN serial data bus for establishing a nested CAN serial data bus (180, 190, 200, 238) carrying, in response to the first serial communications, second serial communications provided to the multiple light heads communicatively coupled thereto, the second serial communications for controlling the light flash sequence from the array; each of the multiple light heads including light head CAN node circuitry, the light head CAN node circuitry including a light head CAN controller electrically coupled to the secondary CAN serial data bus such that an impedance of the light head CAN node circuitry is electrically isolated from the primary CAN serial data bus when an associated light head is operatively deployed in the vehicle; and an array controller (130, 136, 140, 220, 260) including first and second CAN node circuitry configured to communicatively segregate and bridge the primary and secondary CAN serial data buses, the first CAN node circuitry including a first CAN controller electrically couplable to the primary CAN serial data bus so as to establish a first CAN node for facilitating the first serial communications, and the second CAN node circuitry including a second CAN controller electrically coupled to the secondary CAN serial data bus so as to establish a second CAN node for facilitating the second serial communications, wherein the array is: a) a light bar mountable atop a roof of the vehicle; b) a safety director mountable atop of the vehicle and arranged to provide a rearward-facing flash pattern; c) mountable to a rear visor of the vehicle; d) a rear-windshield mountable array arranged to provide a rearward-facing flash pattern; or e) a front-windshield mountable array arranged proximal a visor to provide a frontward-facing flash pattern. a) a light bar mountable atop a roof of the vehicle; b) a safety director mountable atop of the vehicle and arranged to provide a rearward-facing flash pattern; c) mountable to a rear visor of the vehicle; d) a rear-windshield mountable array arranged to provide a rearward-facing flash pattern; or e) a front-windshield mountable array arranged proximal a visor to provide a frontward-facing flash pattern.