No, for safety and security reasons, you are not permitted to stay in your car on a DFDS ferry (or any standard passenger ferry) once the ship has left the port in 2026. Shortly after boarding and before the vessel sets sail, the car decks are cleared of all passengers and sealed for the duration of the crossing. This is a strict international maritime safety regulation designed to protect passengers in the event of a fire, collision, or shifting cargo; the car deck is a hazardous area with limited ventilation and high concentrations of fuel. Once the "clear decks" order is given, you must move to the passenger lounges, restaurants, or your cabin. Access to the vehicle deck is typically only granted in the final 10–15 minutes before arrival at the destination port. If you are traveling with a pet that must stay in the car, some DFDS routes allow for "scheduled visits" accompanied by a crew member, but you cannot remain there for the journey.