Restraint element for a protective wall having a restraint function for motor vehicles, especially for temporary installation to safeguard traffic routes, for example for separating lanes at roadworks sites, having: - a wall body element having a first, maximum width; - at least one stand element, which stand element is arranged on an underside of the wall body element, which underside is intended for installation of the wall body element on a substrate, and extends beyond the first width, preferably a stand element on each side; - at least one end-face connecting element for connection of the restraint element to a further restraint element, which connecting element is arranged in a region between an upper side of the stand element that faces away or is to be positioned facing away from the substrate on the one hand and a side face of the wall body element on the other hand; characterised in that the connecting element, starting from the side face of the wall body element, extends beyond the first width by a first distance and, starting from the upper side of the stand element, extends beyond the latter away from the underside of the wall body element by a second distance; and next to the connecting element there is provided at least one collision protection element, which collision protection element has a deflecting surface which faces away from the side face of the wall body element and away from the upper side of the stand element and is arranged in such a way that the deflecting surface extends obliquely with respect to the side face of the wall body element and obliquely with respect to the upper side of the stand element so that, in a cross-section through the restraint element, a region defined by the deflecting surface, the side face of the wall body element and the upper side of the stand element has a first dimension which corresponds substantially to the first distance, and a second dimension which corresponds substantially to the second distance. - a wall body element having a first, maximum width; - at least one stand element, which stand element is arranged on an underside of the wall body element, which underside is intended for installation of the wall body element on a substrate, and extends beyond the first width, preferably a stand element on each side; - at least one end-face connecting element for connection of the restraint element to a further restraint element, which connecting element is arranged in a region between an upper side of the stand element that faces away or is to be positioned facing away from the substrate on the one hand and a side face of the wall body element on the other hand; characterised in that the connecting element, starting from the side face of the wall body element, extends beyond the first width by a first distance and, starting from the upper side of the stand element, extends beyond the latter away from the underside of the wall body element by a second distance; and next to the connecting element there is provided at least one collision protection element, which collision protection element has a deflecting surface which faces away from the side face of the wall body element and away from the upper side of the stand element and is arranged in such a way that the deflecting surface extends obliquely with respect to the side face of the wall body element and obliquely with respect to the upper side of the stand element so that, in a cross-section through the restraint element, a region defined by the deflecting surface, the side face of the wall body element and the upper side of the stand element has a first dimension which corresponds substantially to the first distance, and a second dimension which corresponds substantially to the second distance. the connecting element, starting from the side face of the wall body element, extends beyond the first width by a first distance and, starting from the upper side of the stand element, extends beyond the latter away from the underside of the wall body element by a second distance; and next to the connecting element there is provided at least one collision protection element, which collision protection element has a deflecting surface which faces away from the side face of the wall body element and away from the upper side of the stand element and is arranged in such a way that the deflecting surface extends obliquely with respect to the side face of the wall body element and obliquely with respect to the upper side of the stand element so that, in a cross-section through the restraint element, a region defined by the deflecting surface, the side face of the wall body element and the upper side of the stand element has a first dimension which corresponds substantially to the first distance, and a second dimension which corresponds substantially to the second distance.