a man is holding a slow sign
There are no street signs.
A sign that someone is holding is not the same as a street sign.
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_sign(x2) & a_slow(s1) & Theme(s1,x2) & n_man(x1))
exists p1 x1.-exists x2 x3.((x1 = x2) & n_sign(x2) & of(x2,x3) & n_street(x3))