Abstract: A single axis accelerometer comprising a swing arm pivotally attached to a frame is held in apposition to a stop by a threshold force until an experienced acceleration force greater than the threshold force causes a distal segment of the swing arm to release from the stop and move toward a sensor that is activated by a sensor trigger on the distal segment of the swing arm.

Abstract: A deceleration-triggered stop lamp installable into for vehicles includes a support frame to which is mounted: a plurality of LEDs; a deceleration sensor; microcontroller; an energy storage component; and power circuitry configured to detect when the vehicle brake pedal has been depressed and to divert power from the vehicles power system to charge the energy storage component. In the event the vehicle decelerates at a rate greater than a predefined threshold, the power circuitry is configured to illuminate the LEDs with power from the energy storage component.