People sitting in a vehicle.
People sit in an old VW van waiting to take a roadtrip.
The vehicle could be any type of vehicle, there is no way to infer that the model of the vehicle is an old VW.  The people could be sitting in the vehicle for any reason, there is no way to know that they are waiting to take a roadtrip.
exists e1 x1 x2 x3.(a_topic(x1) & in(e1,x3) & n_vehicle(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_people(x1))
exists e1 e2 p1 s1 x1 x2 x3.(for(e1,e2) & Topic(e2,p1) & Actor(e2,x1) & v_wait(e2) & exists e3 x4.(Theme(e3,x4) & Actor(e3,x1) & v_take(e3) & n_roadtrip(x4)) & in(e1,x2) & ne_nam_van(x2) & (x2 = x3) & ne_org_vw(x3) & a_old(s1) & Theme(s1,x2) & Actor(e1,x1) & v_sit(e1) & n_people(x1))