Because they would be carrying a boatload of cars with their alarms going off for the entire trip. That would be annoying. The motion of the boat would set off the alarms.
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Parking and the CrossingAfter you've snuggled in, turn off your lights, turn off the engine, set the parking brake, and turn off your car alarm. Your motion detector will indeed detect the motion of the boat.
Park Your Car on the FerryYou don't want to run the risk that a large wave will make your car roll into other vehicles. Lock all of your doors before leaving the vehicle. Do not, however, turn on your car's alarm system.
Once you find your parking spot on the ferry, put your car in park and engage the emergency brake. You don't want to run the risk that a large wave will make your car roll into other vehicles. Lock all of your doors before leaving the vehicle. Do not, however, turn on your car's alarm system.
Generally travelling by ferry is usually considered one of the safest ways to travel. Ferry disasters are very rare, even if the more prominent ones are very memorable. Most ferry accidents are caused by unsuitable weather, overcrowding, and poor vessel maintenance.
Each year somewhere between 800 and 1000 people die in ferry disasters according to Roberta Weisbrod, the executive director of the Worldwide Ferry Safety Association. In the developed world, ferries carrying passengers are relatively safe as we have higher safety standards than the developing world.
Find a seat in the middle of the ferry; the lower you are, the better. So stay low (not the upper deck) and sit in the middle. But.. Window seats tend to be better (a tip that might collide with the seat in the middle of the ferry) if you keep your eyes on the horizon.