I like the idea of them, but frankly the London ones are a poor design IMO — the male/female symbols are too much of a departure from the expected iconography. It also represents a hazard for the colourblind. The other cities listed here have managed to incorporate diversity while still maintaining clear communication.
Stockholm too
https://www.sverigesradio.se/artikel/6732387
And Vienna
I like the idea of them, but frankly the London ones are a poor design IMO — the male/female symbols are too much of a departure from the expected iconography. It also represents a hazard for the colourblind. The other cities listed here have managed to incorporate diversity while still maintaining clear communication.