People stand outside watching motorcycles drive down a road.
People watching motorcycles.
People watching motorcycles is a restatement of "people stand outside watching motorcycles," just without the place information.
exists e2 e1 p1 s1 x1 x2.(for(e1,e2) & exists e3 s2 x3.(a_down(s2) & Manner(e3,s2) & Theme(e3,x3) & Actor(e3,x2) & v_drive(e3) & n_road(x3)) & Recipient(e2,p1) & Actor(e2,x1) & Topic(e2,x2) & v_watch(e2) & n_motorcycle(x2) & a_outside(s1) & Manner(e1,s1) & Actor(e1,x1) & v_stand(e1) & n_people(x1))
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_watch(e1) & n_motorcycle(x3) & (x1 = x2) & n_people(x1))