I must say and be honest @Lorenzo Candelpergher that I agree with most points that @Francois Germishuysmade firstly The guys who had refusal must have informed on the radio it’s a very basic rule, this way things would have been different.
secondly, I also agree that there were no way for the sweep to spot them or even none of us in the back even before the sweep to see them that they have refusal in a pocket, I guess they were too shy to admit it anyway You know to see five cars on the front and don’t have any visuals before them you’d automatically think that they are already on the other side of the dunes. As mentioned the problem would have been solved IF THEY ANNOUNCED IT.