Green traffic signals light up as people look at motorcycles.
The traffic signal turns green as the motorcyclists talk to the people walking by them.
Looking at motorcycles does not mean that the cyclists talk to the people walking by them.
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 p1 x1 x2 x3 x4 x5.(n_thing(x5) & n_people(x5) & n_talk(x3) & of(x3,x4) & n_motorcyclist(x4) & n_signal(x1) & of(x1,x2) & n_traffic(x2) & exists e2 s1 x6.(as(s1,x3) & to(x3,x5) & by(e2,x5) & Actor(e2,x6) & v_walk(e2) & (x5 = x6) & Theme(s1,x1) & a_green(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_turn(e1))