Tom Joad is portrayed as an outsider who doesn't fit comfortably into society.
Tom's disregard for rules is shown when he asks the truck driver for a lift despite the sticker on the truck.
The truck driver is familiar with roadside restaurants and tries to be liked by others.
The encounter highlights the abuse caused by selfishness, especially in big business.
Steinbeck introduces the theme of abuse caused by selfishness throughout the novel.