What can be used to secure loads carried in a car?

You answered correctly. All three—luggage net, tensioning belt, and anti-slip mat—are suitable tools for securing loads in a car. German traffic regulations require that any cargo be secured to prevent it from slipping, rolling, or falling, even during sudden maneuvers or braking. A luggage net helps prevent items from being thrown into the passenger area. Tensioning belts keep heavy items firmly in place. Anti-slip mats reduce the chance of cargo sliding on smooth surfaces. Using these aids together ensures safe transportation and compliance with traffic safety regulations.