The motion sensor, also known as the human body sensor, is able to detect the presence of people within its range and adjust the brightness of the streetlights accordingly. When a person enters the sensor's detection zone, it triggers an automatic response, sending a signal to the streetlights to increase their brightness. This ensures that the area is well-lit for the safety and visibility of pedestrians, providing optimal lighting conditions for their movement. By utilizing the human body sensor, streetlights can offer appropriate lighting levels based on actual human presence. This intelligent control not only enhances pedestrian safety but also contributes to energy efficiency by automatically adjusting the brightness levels according to actual needs.