A Robstown man was sent to the hospital after he fell asleep at the wheel of his van Tuesday morning and crashed into a guardrail.

Texas Department of Public Safety Trooper 2 Victor Villarreal said the accident occurred on State Highway 44 at about 7:40 a.m. The unidentified man was driving his 1995 Chevrolet G20, which had three other male passengers, when he allegedly drifted off at the wheel.

The men were all reportedly heading to their place of employment in Robstown at the time of the accident, Villarreal said.

The van smashed into the guardrail and slid for a few feet before it flipped over once, DPS officials said.

Large amounts of gas and oil covered the road after the accident, which the Annaville Volunteer Fire Department helped to clean up. Traffic traveling westbound on Highway 44 was stalled for more than an hour, with lines of cars stretching for more than a mile, as crews worked to clear the wreckage and spilled fuel from the road.

The driver was transported to Christus Spohn Memorial Hospital with serious injuries to his head and torso, though none appeared to be life-threatening, Villarreal said. He will also be cited for failure to drive in a single lane.

The passengers had minor injuries, but all refused treatment at the scene.