Ferry
A boat that runs a fixed route across water — a vehicle whose entire purpose is one specific crossing.
A ferry in a dream is the dream's image of a vehicle whose entire purpose is one specific crossing. The ferry does not go where you want; it goes between two points, and you either need that line or you do not. The dream brings the ferry when something in your life — a transition between two known states, a structured handover, a routine passage — is being made by a means that only ever does this one job. A ferry caught in time is the dream affirming the planned crossing. A ferry missed by minutes is the dream noting that the scheduled passage was available and the timing was not respected.