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Phrase(s): Have a safe trip. [and] Have a safe journey.
I hope that your journey is safe.; Be careful and assure that your journey is safe. (Said as someone is about to leave for a trip.) • Bill: Well, we’re off for London. Sally: Have a safe trip. • Bill: You’re driving all the way to San Francisco? Bob: Yes, indeed. Bill: Well, have a safe trip.
McGrawhill's American Idioms And Phrasal Verbs