Instead of binary brake lights on a car, the present disclosure provides methods and apparatus to provide an indicator of brake magnitude of the car. A pressure sensor, accelerometer, or other device capable of approximating the magnitude of a braking force is coupled to a control module, which itself is coupled to auxiliary lights mounted on the car. These auxiliary lights are capable of displaying a pulse, color, or a pattern correlated to the magnitude of the braking force. This gives drivers behind the car an indication of how quickly to respond to a braking car.