"I knew it was wide enough, I knew it was straight enough. There wasn't any wires, and I didn't see many overpasses," Vogt tells Asylum. He reasoned that since the traffic was still light, there would be enough space between the cars that they could slow down and let him in.
His hastily concocted plan worked perfectly. He even managed to pull his Cessna to the side of the road, although the inevitable rubbernecking -- completely justified in this case -- still blocked traffic a mile-and-a-half in both directions.
Link with video from CBS (which is also responsible for the photo.)