A traffic light assembly is disclosed with red, amber and green lights. While light is being emitted, a flashing sequence pattern is generated within the area to enhance the meaning of the signal communicated to the driver. The sequence pattern is formed by changing the colour of light emitted, and or by ceasing to emit light. An intermediate pattern that is different in configuration from any of the sequence patterns is provided at a transition between at least one of the red, amber and green lights to further communicate to the driver that the light signal is about to change and that action is about to be required.