The thin, cylindrical, waist-height metal bollards are meant to be a more attractive alternative to the hulking concrete blocks the New York Police Department had deposited in busier areas around the city following the vehicle attacks, de Blasio said.
"We know we have to do even more to keep people safe", de Blasio said on Tuesday.
Mayor Bill de Blasio has announced plans to install almost 1,500 new permanent perimeter barriers, known as bollards, into the city's streetscape.
Hundreds of new protective barriers will be permanently installed in Times Square and other locations around NY in an effort to block vehicles from hitting pedestrians after deadly attacks a year ago on crowds.
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In a 2010 article in its magazine, Inspire, Al Qaeda encouraged adherents to use vehicles "to mow down the enemies of Allah".
"These additional safety bollards will allow New Yorkers and visitors to be more secure at landmark locations and other sites throughout our city", NYPD Commissioner James O'Neill said. Vehicular terror attacks have also taken place in Nice, France, and other parts of the world in recent years.
The spate of vehicle attacks prompted discussion about what more the city could do to insulate pedestrian areas from traffic, and whether, in Times Square at least, it made sense to further reduce traffic along some blocks. They were installed by the dozens in the area in 2016. The vehicle was eventually stopped by one of the squat metal barriers.