The ones here have a red light on the button, a 4rth light on the traffic light itself, and a circle of lights around the 4rth light as a timer. The chance that they're all broken is so small, it's fine with me.
Didn't know about the blind people one. It sounds cool!
Picture from the internet, but like this. Above the regular red, orange, green there is a 4th one with the text "wait" that will turn on after pressing. It also has a circle of white leds around it counting down to the green light. With these things it's just lean on the pole and wait while comfy leaning.