Crossing the Bayonne Bridge these days is an act of faith. The Port Authority website will let you know when it's closed, generally from 9 to 3 on weekdays, but all the signs leading up to seem to suggest you are heading off the face of the earth. Nevertheless it was open today on my way back from Jersey City.
Navigational Clearance Project, a.k.a, "Raise the Roadway, to allow larger ships into the Port of Newark is well underway, with a completion date of 2019. The pedestrian walkway is closed for the duration.