Weird but true: The Port Authority is actually six months ahead of schedule on a crucial portion of its $1 billion Bayonne Bridge upgrade, officials said yesterday.

Its roadway will be elevated 64 feet by the fall of 2015, a major project that will allow larger vessels to access port terminals.

The original completion date was mid-2016.

PA Chairman David Samson said it’s crucial for the agency to accommodate larger ships in time for the opening of the widened Panama Canal.