Related regulations, there is no specific to ms Joe put forward the "traffic light" sound of doubt. "Red light stop, green line" is traffic knowledge, but the blind brothers because of the invisible, cannot clarify the traffic situation, often hesitate at the crossroads. But as ms Joe said, Shanghai sound reminders are installed on some of the road at the traffic light. In 2004, the Shanghai traffic department has 29 lights at intersections, modified light cancelled the original "green flash" link, by beeping sounds instead, ten seconds before the green to red light beginning sound countdown. When announced sharp sound "click, click, click," suggests that green light; When suspended "drop, drop, drop" sound, suggests that red light. The blind brothers can through different sound to distinguish traffic light conditions.

When modified capital for a signal lamp is controlled 10000 yuan, into buying. But the converted signal commissioning after a period of time, received many complaints reflect the "noise". For all may reduce the influence of surrounding residents of intersection, beeping sounds to everyday open between 8 to 20 points, closed at night. Perhaps is because of the factors, the light then not to pursue throughout the city.