Several off-road vehicles are driving down a gravel road.
Vehicles driving down a road.
Vehicles driving down a road implies off-road.
exists e1 s1 s2 s3 x1 x2 x3.(a_down(s3) & Manner(e1,s3) & Theme(e1,x2) & Actor(e1,x1) & v_drive(e1) & n_road(x2) & of(x2,x3) & n_gravel(x3) & n_vehicle(x1) & a_off-road(s2) & Theme(s2,x1) & a_several(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(a_topic(x1) & down(e1,x3) & n_road(x3) & Actor(e1,x2) & v_drive(e1) & (x1 = x2) & n_vehicle(x1))