A cop stands in front of a car on a busy street.
A cop blocked off traffic due to a accident.
A cop standing in front of a car doesn't mean he blocked off traffic or that it was because of an accident.
exists e1 s1 x1 x2 x3 x4.(in(e1,x2) & on(x2,x4) & n_street(x4) & a_busy(s1) & Theme(s1,x4) & of(x2,x3) & n_car(x3) & n_front(x2) & Actor(e1,x1) & v_stand(e1) & n_cop(x1))
exists e1 s1 x1 x2 x3.(r_due(e1) & to(e1,x3) & n_accident(x3) & a_off(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_block(e1) & n_traffic(x2) & n_cop(x1))