Abstract: The invention relates to a passive safety belt system for motor vehicles. The belt extends from a point of attachment at the floor of the vehicle via a redirecting fitting attached to the door, to a reel mechanism arranged in the door. In the vicinity of the fitting, a strap is attached to the belt. The outer end of the strap is provided with a block which runs in a track on the upper door window frame. When the door is opened, the block is displaced automatically forward in the track, whereby the strap pulls forward the upper end of the active diagonal portion of the belt, so that it is moved away from the seat.