Abstract: Apparatus and associated methods include automatically activating and/or deactivating a vehicle's standard brake lights in response to signals indicative of the vehicle's speed. The signals indicative of a vehicle's speed are received from a vehicle communications bus. In some embodiments, a deceleration value is calculated based on a series of signals indicative of a vehicle's speed received from the vehicle communications bus. The calculated deceleration value is compared with a first predetermined deceleration threshold. If the calculated deceleration value is greater than the first predetermined deceleration threshold, a brake light activation signal is generated. When the vehicle no longer is decelerating or the computed deceleration value falls below a second predetermined deceleration threshold, a brake light deactivation signal is generated. The automatic activation/deactivation of a vehicle's standard brake light may advantageously provide improved safety to following vehicles and drivers.