NEW YORK — A man steered his car onto a sidewalk running through the heart of Times Square and mowed down pedestrians for three blocks Thursday, killing a teenager, then emerged from his wrecked vehicle wild-eyed and waving his arms before he was subdued by police and bystanders.The driver, a 26-year-old U.S. Navy veteran, told officers he was hearing voices and expected to die, two law enforcement officials said.Helpless pedestrians had little time to react as the car barreled down the sidewalk and through intersections before smashing into a row of steel security barriers installed in recent years to prevent vehicle attacks on the square where massive crowds gather every New Year's Eve. The car came to rest with its two right wheels in the air."He didn't stop," said Asa Lowe, of Brooklyn, who was standing outside a store when he heard screaming as people scattered. "He just kept going."Police said 23 people were hit by the car, including an 18-year-old tourist from Michigan who died.