About 1,200 to 1,400 Mercer County junior and senior high school students watched a mock accident at the Mercer County Fairgrounds on Tuesday morning. A sheet is placed over Celina High School junior Jenna Springer after she was extricated from the wreckage of one of the vehicles. The Mercer County Sheriff's office in cooperation with local emergency medical services, fire and law enforcement agencies staged this mock crash for all six county high schools to warn teenagers of the dangers of drinking and driving. Tim Wurster of Celina, who was critically injured in a 1985 accident, also spoke.