A two-vehicle crash at Route 47 and O’Brien Road in unincorporated Hebron left a passenger seriously injured Saturday afternoon, the sheriff’s office said. | Photo: Alex Vucha / Lake and McHenry County Scanner

A 20-year-old man was seriously injured and had to be flown to the hospital after a crash involving an SUV and semi-tractor-trailer truck on Route 47 near Hebron Saturday afternoon.

The McHenry County Sheriff’s Office, Hebron-Alden-Greenwood Fire Protection District and Richmond Fire Protection District responded around 3:47 p.m. Saturday to Route 47 and O’Brien Road in unincorporated Hebron.

McHenry County Sheriff’s Office Sgt. Eric Ellis said deputies received a call for a vehicle crash with injuries involving a black Jeep Grand Cherokee and a semi-truck pulling a trailer.

An investigation shows the Jeep was traveling eastbound on O’Brien Road approaching Route 47.

A two-vehicle crash at Route 47 and O’Brien Road in unincorporated Hebron left a passenger seriously injured Saturday afternoon, the sheriff’s office said. | Photo: Alex Vucha / Lake and McHenry County Scanner

The Jeep stopped just before Route 47 at the stop sign.

The driver of the Jeep reported that they thought the intersection was a four-way stop, Ellis said.

The Jeep proceeded through the intersection as the semi-truck, which did not have a stop sign, was traveling northbound on Route 47.

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The semi-truck did not have enough time to stop in time to avoid the crash, Ellis said.

The Jeep struck the trailer side of the semi-truck and the impact caused heavy damage on the passenger side of the Jeep.

A two-vehicle crash at Route 47 and O’Brien Road in unincorporated Hebron left a passenger seriously injured Saturday afternoon, the sheriff’s office said. | Photo: Alex Vucha / Lake and McHenry County Scanner

Ellis said the Jeep was occupied by the driver and a front passenger.

The front passenger, a 20-year-old man, was seriously injured and a LifeNet medical helicopter landed along Route 47 north of the scene.

The flight crew flew the man to Advocate Condell Medical Center in Libertyville. His injuries were not believed to be life-threatening.

The driver of the Jeep suffered minor injuries, Ellis said. The driver of the semi-truck was uninjured.

Tow trucks were called to the scene for both vehicles. Drugs and alcohol are not a factor in the crash, Ellis said.

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The Driver of the Jeep was cited for failure to yield and failure to reduce speed to avoid an accident.