The cheaper option, which would cost $3.3 to $3.6 billion and take six years, entailed building a temporary 6-lane highway in the location of the Promenade while they repaired the underlying structure. Under this option, lanes would be widened, and shoulders would have been added. In conjunction with the project, the NYCDOT hoped to unify Van Voorhees Park, improve safety at the interchange with Atlantic Avenue and possibly build a pedestrian bridge from Brooklyn Bridge Park to the Promenade. The other, more expensive option, which would cost $3.4 to $4 billion and take over 8 years, was to repair the existing 6-lane highway one lane at a time. The Promenade walkway would be closed for up to six years under the first option, and for two years under the second option, with periodic closures for construction use. The NYCDOT commissioner, Polly Trottenberg, called the project “the most challenging project not only in New York City, but arguably in the United States right now.” $1.7 billion in city funding was allocated for the project, with the remainder to be footed from the state and federal governments.