A construction worker wearing a red helmet and a yellow safety vest is manning a piece of heavy machinery.
A man in a safety vest is directing traffic in the street.
One can not be manning something and directing something simultaneously.
exists e2 e1 s1 s2 s3 x1 x2 x3 x4 x5 x6 x7 x8 x9.(Theme(e2,x8) & Actor(e2,x1) & v_man(e2) & of(x8,x9) & n_machinery(x9) & a_heavy(s3) & Theme(s3,x9) & n_piece(x8) & subset_of(x6,x1) & n_vest(x6) & of(x6,x7) & n_safety(x7) & a_yellow(s2) & Theme(s2,x6) & subset_of(x2,x1) & Theme(e1,x5) & Actor(e1,x4) & v_wear(e1) & n_helmet(x5) & a_red(s1) & Theme(s1,x5) & (x2 = x4) & n_worker(x2) & of(x2,x3) & n_construction(x3))
exists e1 x1 x2 x3 x4 x5.(n_street(x5) & in(e1,x5) & Theme(e1,x4) & Actor(e1,x1) & v_direct(e1) & n_traffic(x4) & in(x1,x2) & n_vest(x2) & of(x2,x3) & n_safety(x3) & n_man(x1))