From now on, nearly a kilometer (mile) of Oxford Street between Orchard Street and Great Portland Street will be traffic-free, with vehicles diverted onto surrounding roads. The move is the first step in a makeover of the storied shopping precinct, with plans to plant trees, install seating and add two new public squares.

Oxford Street still sees about half a million visitors a day, with shoppers bustling between retailers such as Selfridges, Zara and John Lewis.

But city officials say pedestrianizing the street will put it back into the league of top global shopping destinations like Times Square, the Champs-Élysées and La Rambla.

“This is a momentous day for London, a momentous day for Oxford Street,’’ London Mayor Sadiq Khan told the BBC. “It’s a new era.’’

While local officials began discussing the idea of pedestrianizing Oxford Street more than a decade ago, momentum began to build over the last two years when the mayor’s office created the Oxford Street Development Corporation to shepherd the project. That helped overcome opposition from local residents who complained that diverting vehicles from Oxford Street would clog their neighborhoods with traffic.

A public consultation later determined that removing traffic would attract new shops and visitors to Oxford Street, making it “an iconic destination.”

The project also got a boost from the new Elizabeth express train line, which runs through the heart of the city, with a stop on Oxford Street.

Further work on the makeover will begin in the new year, with city officials refining their plans based on feedback from visitors, Khan told reporters Monday on a rain-soaked Oxford Street.

“In advance of Christmas, you know, I want people to come here and shop and enjoy the experience,” he said.

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Kwiyeon Ha contributed