Some 1,500 barriers will be installed in New York City to stop vehicles from deliberately hitting pedestrians.
The city already has some temporary barriers, which will remain after the new ones are rolled out from March.
The 1,500 metal barriers will cost the city $50m (£36,7m) and the move comes after a number of deadly attacks on crowds last year.
In May, a man thought to have taken drugs drove for more than three blocks, hitting people along the way.
An 18-year-old died and the man was stopped when his vehicle hit one of the barriers.
In October, a terrorist drove down a cycle path near the World Trade Center, killing eight people before he was shot by police.
The city’s mayor Bill de Blasio said: “In 2017, New Yorkers witnessed the horrible capacity of people willing to do us harm, whether it was in our subways, on our bike paths or in Times Square.
“But we will not be cowed, and our expanded investment today in barriers and bollards in our public spaces underscores our resolve in keeping New York City safe from future attacks.
“In this new year, we can and will protect our iconic public spaces while New Yorkers go on living our lives, including by hosting a record number of tourists.”
ABC reported that the city conducted a review of locations, including business corridors, tourist attractions and iconic sites, identifying 10 key locations to be given permanent protection.
In a statement, Police Commissioner James P. O’Neill said: “These additional safety bollards will allow New Yorkers and visitors to be more secure at landmark locations and other sites throughout our City.
“They will also serve to delineate restricted areas and help streamline vehicle, bicycle and pedestrian traffic in these areas.”