Eight years may not be that long to turn into film that most iconic of iconic novels, Jack Kerouac's "On the Road," the book that has launched many into sustained bouts of daydreaming. Because eight years is the time it took for the project to mature. Plus, the film was lensed by one of our better filmmakers and is based on the ultimate American myth, the road story (the open road is there for the taking, there’ll always be someone motoring