The father and sister of a Michigan teen killed when a maniac mowed down pedestrians in Times Square with his car during a May 2017 rampage have slapped the city with a lawsuit saying the Big Apple should have been better prepared for a vehicular terror attack in the Crossroads of the World.

Distraught dad Thomas Elsman is joined in the suit by six survivors of the attack — which unfolded after Richard Rojas allegedly smoked some PCP and then barreled up Seventh Avenue in his Honda Accord, hopping the sidewalk and aiming for pedestrians.

Rojas, who is also named as a defendant in the suit, is awaiting criminal trial on charges of murder, attempted murder and assault.

But Elsman, whose 18-year-old tourist daughter Alyssa died in the attack, and the other plaintiffs — Destiny Lightfoot, Caroline Johns, Gayatri Jariwala, Shahil Jariwala, William McCollough and Catherine McCoullough — say the city knew better than to leave the area open to vehicular attack. Elsman’s younger daughter, who was with Alyssa, was also injured.

“New York City knew that pedestrians in this area were targeted previously, and remained a target for criminal activity and terrorist acts, yet the City failed to provide reasonable and expected protection and security from such criminal activity and terrorist acts,” the Manhattan Supreme Court suit reads.

The suit says the city “should have known, and in fact did know, that Times Square, of which 7th Avenue from 42nd Street to 45th Street is an integral part, was considered a target for criminal activity and potential terror attacks, and specifically a terror attack in which a motorized vehicle would attempt to strike and severely injure or kill multiple pedestrians.”

The papers, which ask for unspecified damages, cite the foiled 2016 Times Square terror attack by Mohamed Rafik Naji, as well as the terror attacks in France, Germany and Sweden by murderous men in cars.

“We’ll review the complaint and respond accordingly,” city Law Department spokeswoman Kimberly Joyce said in a statement.

Rojas’ criminal attorney did not immediately respond to a request for comment.