Talk to neighbors and transportation activists, and you’ll get pretty much the same answer: The best option for replacing the aging Massachusetts Turnpike viaduct in Allston is a new stretch of highway at ground level. Ask state Transportation Secretary Stephanie Pollack, who will make the final call, and, well, she’s still wondering if the state should just build another viaduct. Pollack will know more soon, when a consultant is expected to weigh in with a deep analysis of the options for the $1 billion-plus project to straighten the turnpike where it curls around an old rail yard in Allston, the...