A narrative structure can impact a novel greatly, especially in crime, where we might need to classify whether a character is an outsider or an outlaw. If Sallis had chosen to tell the story in a linear pattern, the book wouldn't be the same. In fact, I don't even know if the book would be interesting if it was told in order. The non-linear structure, in a way, establishes Driver as a rebel. And in a way, Sallis is also a rebel because he is going against the narrative conventions. Most fiction is usually told in a linear pattern but sometimes, revealing events in a different order can make the reading of the text very interesting.