Cars drive down a city street.
Cars drive down a busy city street.
just because city street driving  and busy city street driving are different
exists e1 s1 x1 x2 x3.(a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_drive(e1) & n_street(x2) & of(x2,x3) & n_city(x3) & n_car(x1))
exists e1 s1 s2 x1 x2 x3.(a_down(s2) & Manner(e1,s2) & Theme(e1,x2) & Actor(e1,x1) & v_drive(e1) & n_street(x2) & of(x2,x3) & n_city(x3) & a_busy(s1) & Theme(s1,x2) & n_car(x1))