Method and apparatus for locking and unlocking brake lights

The present invention addresses the need to sustain brake lights illumination of a motor vehicle at substantially stationary state even after brake pedal is released in order to ensure traffic safety. This device employs a number of commonly available relays not only to sustain the power to the brake lights but also to monitor the state of the movement of the vehicle. The circuit is largely composed of three main sections: a power supply relay, a latching-unlatching relays and a sensor array. One common type of relays can be used to all three of these parts. Different from prior arts in this matter, no sensor on a power shaft is needed, although such device can be accommodated. Instead, simple tilting type mercury switches are used for sensing the acceleration of a vehicle. This device can be integrated with many other motion sensing devices. These sensor actions can also be blocked or supplemented by the engagement of the parking brake or the cruise control. This device can be manufactured and installed originally in the factory, or can be installed by a user with a few tools economically.