Green traffic signals light up as people look at motorcycles.
Traffic signals light up by the people.
Green traffic signals light up people. and as people look at motorcycles.
exists e1 p1 p2 x1 x2.(exists e2 x3 x4.(at(e2,x4) & n_motorcycle(x4) & Actor(e2,x3) & v_look(e2) & n_people(x3)) & as(e1,p2) & exists s1 s2.(a_up(s2) & Manner(s1,s2) & Theme(s1,x1) & a_light(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_signal(e1) & n_traffic(x1) & of(x1,x2) & n_green(x2))
exists e1 s1 x1 x2 x3.(n_people(x3) & ne_nam_traffic(x1) & by(e1,x3) & a_up(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_signal(e1) & n_light(x2))