All the usual questions associated with this kind of design pop up.

How are you supposed to make a right turn? How can you prevent left-hooks by left-turning drivers who did not see you because you were hidden by parked cars? How likely do you think is that lane to be blocked by car passengers, pedestrians, big cardboard boxes (being unloaded by delivery trucks)? How do you pass slower cyclists? How do you avoid a big pothole or a couple of construction cones or a big patch of glass?

It's similar to physically separated bike lanes, only worse, because visibility is obscured and peds are more likely to crowd the space. New York had to remove those segregated bike lanes because no one was using them. Why do they want to do a stupid thing again?