Traffic switched over at new Gov. Mario Cuomo Bridge, replacement for Tappan Zee

TARRYTOWN, New York (WABC) -- Traffic is now heading into Westchester County on the new bridge over the Hudson River.

All four lanes of Westchester-bound traffic have officially shifted to the first span of the Governor Mario M. Cuomo Bridge.

Rockland-bound traffic lanes opened in late August.

Crews will now demolish the landings of the old bridge to connect the second span of the bridge to land.

The project is set to be completed by 2018.

A 1929 Model A Ford Phaeton made the final journey across the Hudson.

Seth Kestenbaum was the last driver to cross the 61-year-old bridge around 10 p.m. in the vintage Ford.

"If you're first across the bridge, everyone's going to be repeating that," Kestenbaum said. "I'm the last one to cross the bridge. I've got to tell you, what an honor."

The project launched by the Thruway Authority in 2013 will replace the 62-year-old Tappan Zee Bridge, a critical link in the Northeast U.S. highway system.

The Tappan Zee had served as the poster child for crumbling infrastructure. President Barack Obama used it as a backdrop in 2014 when he asked Congress for more infrastructure funding.

The first span of the long-awaited replacement is expected to carry more than 50 million cars across the Hudson River.

The 3-mile bridge linking Westchester County to the New York State Thruway across the widest point in the Hudson is one of the largest public infrastructure projects underway in the U.S. and a model of the latest engineering.

(The Associated Press contributed to this report)