I think the big picture goal of reducing speeds is much more than putting up a different sign. There's a whole movement out there pushing for denser development

I think the big picture goal of reducing speeds is much more than putting up a different sign. There's a whole movement out there pushing for denser development, reduced car-driven-development, and streets that are truly lower speed, not simply highways rebranded with different signs. Segregating types & speeds of traffic is still good though, especially dedicated trails for pedestrian and/or bike traffic.