A traffic signaler waves traffic by on a busy street.
there is a busy street being controlled by flaggers.
A traffic signaler controls traffic by flagging 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 p1 x1 e1 s1 x2 x3 x4.((x1 = x2) & Actor(e1,x4) & n_flagger(x4) & Theme(e1,x3) & v_control(e1) & (x2 = x3) & n_street(x2) & a_busy(s1) & Theme(s1,x2))