People who are blind don't necessarily lack vision - that's why the bobbled paving slabs at the edge of crossings and train platforms are bright yellow. [1] Ad

People who are blind don't necessarily lack vision - that's why the bobbled paving slabs at the edge of crossings and train platforms are bright yellow. [1] Admittedly the LED wouldn't do anything a tactile or audible click wouldn't do here, but a blind user most likely would be able to see that an LED was lit somewhere. [1] https://www.youtube.com/watch?v=cdPymLgfXSY https://www.youtube.com/watch?v=cdPymLgfXSY