A Pulitzer Prize finalist in the cartoonist category, Pat Bagley has worked for The Salt Lake Tribune for more than 45 years.

Rober set up a giant wall made of foam blocks, resembling a typical Hollywood set – a so-called "fake road wall." Even to the human eye, distinguishing the photo wall from a real road was difficult.

The two vehicles are driven at a wall painted to resemble the road continuing ahead—an optical illusion, of sorts, familiar to anyone who grew up watching cartoons on Saturday mornings.

He created a polystyrene wall with an image of a road printed on it and placed it in the middle of a real street to evaluate the reaction of the sensors in his own Tesla Model Y, which relies only ...