On Saturday, October 24, 2015, about 10:31 a.m., a 2014 Hyundai Elantra passenger car operated by a 25-year-old female driver was traveling southbound on Main Street heading toward Hall of Fame Avenue in Stillwater, Payne County, Oklahoma. Traffic in this area was restricted at the time for a homecoming parade that was in progress for Oklahoma State University (OSU). A police motorcycle was stopped in the roadway, partially blocking the southbound lanes of Main Street, while its operator spoke to a person at the roadside. The emergency lights on the motorcycle were not illuminated. The Hyundai struck portable barricades and the motorcycle; it then continued into Hall of Fame Avenue, where it struck a crowd of parade spectators. As a result of the crash, 4 parade spectators died and 54 received injuries of varying degrees.