Speed is of the essence at a bus stop. If you want to board, you need to find the button to open the door quickly. LEDs light up in a circle around the corresponding hand symbol, but at night the diodes can be so bright that it can be difficult to see, especially for older people. Bus manufacturer EvoBus of Mannheim is therefore looking for ways to produce a new kind of button that does not dazzle and yet remains clearly visible in any light conditions.