A seatbelt stands for security and restraint at once — staying safe by accepting a limit. Dream books read struggling with it as feeling held back, and fastening it as care for yourself before something new.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.