Well, it largely is. Where is he supposed to walk? He was about as far over toward the shoulder as he could be without actually being in the gravel on the side of the road. There is no pedestrian space on that road. And when you are a pedestrian you are supposed to walk against traffic, not walk along with it with your back to oncoming cars.
The real answer is that he should have realized America is unwalkable and not done this silly mission. Or taken the
American Discovery Trail like this Something Awful goon tried and failed miserably to do a decade ago