New York transportation authorities on Thursday began placing hundreds of large concrete barriers at 57 intersections along the Hudson River Park Bikeway in an effort to protect the popular path from future terror attacks.

The move comes after the attack on Tuesday, in which Sayfullo Saipov is accused of driving a rental truck for a mile down the narrow bikeway, killing eight people and injuring 12 others.

Ben Sarle, a spokesman for Mayor Bill de Blasio, said that the concrete barriers would be placed at both vehicle and pedestrian intersections of the bike path between 59th Street and Battery Park, along the West Side Highway. At each of the 31 vehicle access intersections, the State Department of Transportation will put in six concrete jersey barriers. At each of the 26 pedestrian access intersections, the City Department of Transportation will place two large concrete cubes.

Jennifer K. Post, a spokeswoman for the state Transportation Department, said the agency began installing jersey barriers on the path on Thursday morning. The department will continue to evaluate if additional or different measures need to be taken, she added.