Blind people can hear the sound it makes.
Source : when you are initially registered blind in the UK a rehab officer comes round and explains all the workings, including the largely unknown spinner on the underside of the switch box. And yes, please don't stick gum there.
But this is about the design of an Australian button, and the Australian button we are talking about always makes sound.
I said the lozenge was to assist deaf people. DanBC asked for a clarification that I meant deaf people rather than not blind people, and cross-compared to a UK pedestrian button. I clarified that blind people can hear the sound that Australian buttons make.
You missed the point entirely, downvoted my post and started talking about how not all UK buttons make sound.
That's nice, but not what everyone else was talking about. (twit)
Actually I find it profoundly challenging but usually rewarding enough to justify the effort. Usually.
One day I shall write a short guide titled 'Rhetorical Questions : how might we answer them?'. 'Can you [not] X' will be chapter 2. Prize of one splendid upvote for anyone who can guess the title of chapter 1.
Not all crossings have sounders.
Deaf people can always see the lights. Blind people can't always hear the sounders.