That arithmetic may explain why out of 70 area ferry routes tried in the past 30 years only 20 have survived, said Jeffrey Zupan, a senior fellow for transportation at the Regional Plan Association, an urban-planning group. Successful water transport, such as the Staten Island Ferry or the Hudson River lines from New Jersey, have common characteristics, Zupan said: terminals in densely populated sections or areas easily accessible to commuters, frequent departures and a short, direct route to a major business district like Wall Street. In the new blueprint, trips would include as many as four stops en route to Manhattan. Assuming docking takes five minutes, that would add 20 minutes to a trip, Zupan said. “If all these ferry routes were a slam dunk, they would have been done by now.” Read the full article in Bloomberg Business.