A traffic signaler waves traffic by on a busy street.
some cars are stuck in traffic.
It is possible for traffic to be busy without being stuck in it.
exists e1 s1 s2 x1 x2 x3 x4.(on(e1,x4) & n_street(x4) & a_busy(s2) & Theme(s2,x4) & a_by(s1) & Manner(e1,s1) & Actor(e1,x1) & v_traffic(e1) & n_wave(x1) & of(x1,x3) & n_signaler(x3) & of(x1,x2) & n_traffic(x2))
exists e1 x1 x2.(in(e1,x2) & n_traffic(x2) & Theme(e1,x1) & v_stick(e1) & n_car(x1))