I will not be able to attend tonight's big meeting in Brooklyn so I really hope that someone will ask DOT about this and report back on what they say:
At the big Houston Street bike lane meeting a couple of weeks ago, DOT's Ryan Russo and Josh Benson told Manhattan's Community Board 2 that physically-separated bike lanes should only be installed on streets with a maximum of 8 intersections per mile. Houston Street has 18 intersections per mile which, they believe, makes it not a good spot for a Class I bike lane.
Ninth Street in Park Slope, Brooklyn has exactly 8 intersections per mile. It therefore meets DOT's own standards for when a physically-separated, on-street bike lane is warranted! On top of that, neighborhood people are upset about the idea of a bike lane preventing them from occassionally double-parking to load and unload their cars. A physically-separated bike lane might be an answer to those concerns and a real win-win.
The lanes could be put between the sidewalk and parked cars as is done in so many great biking cities around the world. Here is an example from Copenhagen, Denmark:
Another possibility would be to run both lanes between the sidewalk and parked cars along the southern side of 9th Street, away from the double-parking commotion in front of the grocery store, post office and car service station. Here is a two-way bike lane I saw in Paris, France recently (no one is riding because it is in the middle of a hail storm):
It's just Thermoplast. Can't we experiment in New York City?