A barrier wall element of a vehicle restraint system includes a coupling part having a first leg which has a free end forming a first hook extension and a sliding surface arranged on a side of the first leg. The side faces away from the first hook extension, and a second leg has a free end forming a second hook extension. When coupling the coupling part to an identical coupling part of another barrier wall element, the first hook extension rests in a first contact region on the second hook extension of a further coupling part. The second hook extension rests in a second contact region on the first hook extension of the further coupling part. The first and second contact regions are spaced from one another in a tensile direction of the tension member by a distance which is smaller than a width of the first leg.