What about simply doing what Monsey Trails does and having men on one side of the aisle and women on the other side of the aisle. Very easy, there’s no concept of ‘moving back’ in a negative way, etc.
It is harder to do that on a city bus with people always getting on and off.
Also, the concept of “moving back” is part of the American experience, and does not have any inherently negative connotation in Israel.
The difference here, on a public bus, is that unless there is MORE THAN ONE bus, going the same route as the gender-separated one, to give people the option of sitting as a family or something, or it is obvious and known that this is a gender-separated bus (as this one seems to be), it really can’t be sustainable.
It is that way. And anyway, the neighborhoods are segregated by religious affiliation so a non-chareidi has little reason to go there anyway.