Abstract: A collision safety device at an end section of a crash barrier (2) which includes at least one crash barrier girder (3, 4; 28) or profile. The crash barrier girder (3, 4; 28) extends along the ground a distance above it. In the region of the end section of the crash barrier (2), there is a safety member (6) which is disposed to be hit by a colliding vehicle and, under the action thereof, be displaced along the crash barrier (2). The safety member (6) has a forming device (7) which engages with the crash barrier girder (3, 4). When the safety member (6) moves along the crash barrier (2), a configurational change of the crash barrier girder (3, 4, 28) is realized. The forming device (7) has an entry end (8) in line with the undeformed crash barrier girder (3, 4; 28) and an exit end on a lower level in order that the deformed crash barrier girder will be capable of being driven over by the colliding vehicle.