Earlier quoted context omitted.
That's just fair - pedestrians aren't detected either
Pedestrians have a button to press to let the signal know they exist. Until we invent car-hands, that seems equivalent enough.
[1] - https://www.nytimes.com/2016/10/28/us/placebo-buttons-elevat...
[2] - https://www.nytimes.com/2004/02/27/nyregion/for-exercise-in-...