The generic masculine is insidious and destructive.
"Man and his greatest achievements...." bullshit is everywhere devaluing half the population.
That along with the widespread disrespect of calling grown women "girls" extracts a price beyond any financial measure, though it is reflected in the underpaid female workforce's wages.
"Single Mother at Work" might get some attention, which is the whole point to placing the signs.
Regardless, iconic signs with pictograms and no writing have long been available so this whole situation should not even exist now.