It’s an unusual sight, hundreds of people walking in the middle of the street on Fifth Avenue.

Sunday marked the first day of “Fifth Avenue For All.”

Mayor Eric Adams announced this plan back in November to turn the avenue into a car-free street for three Sundays in December.

“Fifty years ago, Mayor Lindsey tried this. He closed Fifth Avenue. It was an experiment to test to see if New Yorkers really enjoyed an open pedestrian only Fifth Avenue, but today we don’t need to test,” Deputy Mayor Meera Joshi said. “We have plenty of examples around our city of positive economic and social benefits we get when we let people enjoy the streets of New York City.”

“You can see all the Christmas lights and you’re walking down the street with no cars coming,” Luisa Giannini, who’s visiting her grandmother from Connecticut, said.

A portion of Fifth Avenue will be closed to cars from noon to 6 p.m. — leaving more room for visitors and New Yorkers to enjoy the iconic holiday decor and shopping along the avenue.

“We’re all used to parades here on Fifth Avenue, and it feels like this is just for us,” she continued.

The city said traffic will be heavier around this area as more gridlock alert days approach.

To avoid traffic, the city is encouraging the use of public transit. Buses that run down Fifth Avenue will also be rerouted.

That change of plans isn’t sitting well with the MTA.

In a statement, the agency told NY1, “The impact on bus riders is regrettable and we plan to return to the City this week to ask again for a solution that allows buses to continue down Fifth Avenue during the holidays in dedicated lanes that reduce travel time and inconvenience for New Yorkers.”

Despite the traffic disruptions, the Fifth Avenue Association said this is exactly what the city needs during the holiday season.

“People really want to be together and we want to make sure there’s enough space for people to feel comfortable to come together and really take in the city,” Ed Hogan, chairman of the Fifth Avenue Association, said

The car-free zone is from 48th to 57th Street.

However, police will be at the crosswalks — allowing cars to cross Fifth Avenue.

“It’s great you don’t have to get pushed around on the sidewalk, it’s comfortable,” Ronald Melvin, who’s visiting the city from Toronto, said.

The Melvins said they are regulars of the city and that they think the city should do this more often.

“I think that everybody wants to come out and if you can give space with permission for them to browse around without any danger just a great community for tourists and locals,” Wendy Melvin said.

Each Sunday, there will be live performances and vendors set up along the 11 blocks.

And in this area known for shopping, some stores are offering incentives to get people visiting.

To find those incentives, visit fifthavenue.nyc.