Kenneth Carl Theiman Jr., 31, of Dallesport, Wash. tumbles along I-84 after losing control of his motorcycle at about 85 mph.

THE DALLES, Ore. -- Trooper Michael Holloran was sitting in his Oregon State Police patrol car on the shoulder of Interstate 84 when he heard a fast-approaching vehicle at 7:18 a.m. on June 18.

Holloran looked in the sideview mirror and saw the motorcyclist lose control.

The in-dash camera in Holloran's patrol car captured the rest:

The motorcycle slides by on its side.

Then the motorcyclist tumbles into view.

As he comes to a rest, the motorcyclist manages to stands up.

The motorcyclist stumbles around for a moment as Holloran runs to his side.

"I got an ambulance coming for you, OK?" Holloran tells the motorcyclist. "Just relax, stay calm."

"Oh, Christ!" the motorcyclist yells. "I looked up -- "

"You saw me, probably," Holloran says.

The motorcyclist -- Kenneth Carl Theiman Jr., 31, of Dallesport, Wash. -- estimated his speed when he lost control was about 85 mph. Click the link to watch the video.

Theiman recently pleaded guilty to careless driving. Oregon State Police released the video as a public caution about how quickly drivers can lose control at high speeds.

"It only takes a second for something to happen that you may have to react to while keeping your vehicle under control," said OSP The Dalles Area Command Sergeant Pat Shortt.