The neglect and selfishness of one, resulting from imprudent habits, will cause tragic accidents that lead others to suffer.
"Cars change their meaning and become a symbol of death."
The main characters do not really realize how corrupt they are, and how they act against other people. In addition, the driver says: "I know very little about driving, almost nothing.
This suggests that the characters are not very good at dealing with social problems, and that for them trying to solve these problems will end in tragedy.