At a packed town hall meeting in Brooklyn Thursday evening to discuss options for saving a crumbling section of the Brooklyn-Queens Expressway, city officials from the Department of Transportation came up against some not-unexpected pushback against a proposal that would involve closing the Brooklyn Heights promenade for six years. This was the first public meeting since the city unveiled two separate proposals for the project last week. The meeting opened with a presentation of both options—each projected to cost between $3 billion and $4 billion—while Polly Trottenberg, the city’s transportation commissioner, braced herself for the inevitable backlash. “I understand a...