Protective device for combination road vehicles The device comprises a safety net covering at least the area between the upper edge of the seat back rests and the vehicle roof. The net is fixed to an upper cross tube extending over the vehicle width and a parallel lower cross tube. Straps engage on the lower cross tube with tensioners for tensioning the lower cross tube downwards. The upper cross tube is the upper frame part (321) of a trapezoidal tube frame (32), the parallel lower frame part (322) of which, when viewed in the direction of travel, loosely located behind the safety net. The tube frame in the area of the lower frame part is fixed by means of self-aligning fixture components (37) to the vehicle at a distance from the vehicle roof (14) which is smaller than the frame height.