On my car it works from behind other cars as well. There's a tree lined road near me, drive behind someone at night and there's a dark box around them, with the

On my car it works from behind other cars as well. There's a tree lined road near me, drive behind someone at night and there's a dark box around them, with the the trees being fully lit up. And it also works with over-reflective road signs, they too get a dark box.