The driver of a bulldozer was seriously injured Tuesday when he fell from the machine — which continued unmanned before crashing to a stop into a parked van at a Riverhead construction site, police said.

Riverhead Town police said Suffolk County’s police aviation unit airlifted the bulldozer operator, 42, who had internal injuries, to Stony Brook University Hospital.

Riverhead police responded to a call at about 10:19 a.m. for an injured man who had fallen off the bulldozer at the rear of Riverhead Nissan on Old Country Road.

Police said they found the operator on a stretch of land between the auto dealership and a Costco that was being cleared and leveled.

In a news release, police said it was determined the driver “had fallen off a bulldozer and was injured after coming in contact with the bulldozer.”

The machine then continued westbound across the property, striking an unoccupied parked van before finally stopping in the rear parking lot of an Applebee’s restaurant.

The Occupational Safety and Health Administration also is investigating, police said.

Anyone with more information is asked to call Riverhead Town Police at 631-727-4500.

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