traffic is present on the road and people are waiting to cross the road.
Traffic is backed up because of an accident.
It cannot be inferred that the traffic is because of an accident.
exists e1 p1 s1 x1 x2 x3.(n_road(x2) & n_road(x2) & Topic(e1,p1) & Actor(e1,x3) & v_wait(e1) & exists e2.(Theme(e2,x2) & Actor(e2,x3) & v_cross(e2)) & n_people(x3) & on(s1,x2) & Theme(s1,x1) & a_present(s1) & n_traffic(x1))
exists e1 s1 x1 x2.(ne_nam_traffic(x1) & of(e1,x2) & n_accident(x2) & r_because(e1) & a_up(s1) & Manner(e1,s1) & Theme(e1,x1) & v_back(e1))