The Port Authority says around 4,300 fewer vehicles crossed the span on Monday, an 11 percent drop from the previous week.
Drivers seem to be avoiding the route after warnings about delays.
Increased congestion is due to construction on the nearby Alexander Hamilton Bridge, which connects Manhattan and the Bronx and is the go-to route for New Jersey drivers headed to the GWB.
Commuters had been expecting gruesome traffic due to the three-month, $400-million, 24-hour-a-day job. Workers will be replacing the deck and reinforcing the steel on the Alexander Hamilton.
The work began Saturday night.
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