SHERIDAN- LaSalle County Deputies are investigating a two vehicle accident that occurred about 3 miles south of Sheridan that sent one driver to the hospital via helicopter early Wednesday morning. A northbound passenger car struck a southbound semi truck with a trailer head near IL Route 71 near E. 27th Rd. Serena and Sheridan EMS and Marseilles Ambulance were dispatched to the scene. The semi driver was not injured, however the driver of the passenger vehicle was transfered to OSF Ottawa St. Francis Hospital in Peoria by life flight. The accident remains under investigation by the LaSalle County Sheriffs office and the Illinois State Police.