Person holding stop sign to direct traffic.
a person stops traffic
Holding a stop sign implies stopping traffic.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & to(x1,x4) & n_traffic(x4) & a_direct(s1) & Theme(s1,x4) & n_sign(x1) & of(x1,x3) & n_stop(x3) & Actor(e1,x1) & v_hold(e1) & (x1 = x2) & ne_nam_person(x2))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_stop(e1) & n_traffic(x2) & n_person(x1))