...unbeknownst to just about everyone he and Garrett Hedlund took to the road for a second time in April of 2011. They spent two weeks along with a crew of five and blasted 4,000 miles across the back roads of the USA. They purposefully avoided the interstate highways not built until the 1950s, retracing as best they could the original route of the two lane roads Jack & Neal drove. The purpose of this unpublicized trip was for Walter and Garrett to be involved in the "Second Unit" shooting themselves. True to their desire to make On The Road as authentic as they could they wanted to capture the images of the '49 Hudson roaring across the continent with the sights and sounds of the country in the background. The story of On The Road is also the story of America and the film makers wanted to capture the physical and human geography at the core of On The Road as part of the film.
Here's more about the '46 Hudson they drove and the speeding tickets they avoided.