Two propellers are the standard choice for double-ended ferries. If the vessel is big enough, one propeller is installed midships at each end of the vessel.
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If a vehicle is broken down onboard, the responsibility ultimately is with the owner of the vehicle. The ferry crew is under no obligation to re-start vehicles that have broken down.
The golden rule is, something will sink if it's heavier than the water it is displacing. Therefore, a bowling ball would sink, but a football would float. In the case of a ferry, gravity pushes down on the boat, but buoyancy helps it stay afloat as it's not as heavy as the space it's taking up.
Classically, ferries are driven just like any other ships. In practical terms, this means that they run on heavy fuel oil or marine diesel. In recent years, however, there has been a change in thinking, so that alternative forms of propulsion are being used more and more.
The biggest ferry on the Channel, the Spirit of Britain is 700 feet long, almost 100 feet wide, and can carry more than 1,000 cars as well as 2,000 passengers.
Some, if not most, car alarms have shock and motion sensors (ever heard a car alarm go off when a big truck passes by?). Cars are usually left on solid ground and any lateral movement when at rest is typical of a thief trying to gain entry. The rocking of a boat on water is lateral movement and could set an alarm off.