Not continuously but if the crossings were on a schedule during the night then you would hear it every couple of minutes.
Following the rest of the above comments might clear it up but I'll outline the thought process
1: People think it is dumb that they turn off the schedule during the night.
2: It's because the walk signal is going to annoy people if it's going off regularly, especially at an intersection.
3: Of course the locator pings will continue because vision impaired people have to be able to find them, nobody is going to complain about this. They ping whether on schedule or during times you need to press the button.
4: the grandparent comment of mine suggested that the crossing should only make a sound if the button has been pushed.
5: the reply below that says "They beep intermittently so you can find them to press them in the first place." thinking the comment was saying that the comment was talking about the pings and not the walk sound
6: I clarified what they must have been saying including a video for them and anyone who hasn't been to Sydney and might not know what the sounds are
7: you made a snarky comment presumably without understanding any of the context.
As the previous comment states it might be a good idea to simply leave the locator pings but only make the walk sound if the button has been pressed
Video of the sound for reference: https://www.youtube.com/watch?v=B0cz1XW9QvE