Manhattan's buses are already extremely frequent on popular routes (double-length buses scheduled every 2-3 min during rush hour on routes that aren't redundant

Manhattan's buses are already extremely frequent on popular routes (double-length buses scheduled every 2-3 min during rush hour on routes that aren't redundant to subway service, and even on a few that are -- and still packed) and limited by traffic more than anything. AFAICT most people who drive to work in Manhattan on a regular basis do so because they live far enough out in the boroughs or suburbs that getting to the subway/commuter rail is a PITA. There is a large contingent in residential areas of Manhattan above 59th St. that take cabs to work -- especially on the East Side where the subway is often too crowded to get on. Although the 2nd Ave subway (if it opens as projected in 2017) will probably make the subway a more palatable option, I could see something like this being an alternative for some of those riders -- cabs can be difficult to find in the morning, and this would be far less expensive.