Tactile paving is a system of textured ground surface indicators. It aims to assist pedestrians who are blind or visually impaired (see Wikipedia) and is also called truncated domes, detectable warnings, Tactile Ground Surface Indicators, or detectable warning surface. In Seoul, Korea, some of the tactile pavings light up at night. Interestingly, its color turns the same color with the traffic light; it turns red when the traffic light is red, and it is green when the traffic light is green.
This lighting system will not only benefit visually impaired pedestrians; it will also enhance the safety of the pedestrians who are distracted by their own tasks (e.g., listening music by earphones or sending text messages by their smart phones)!