A group of people riding on motorcycles down the road wearing helmets.
A group of people are driving cars down the road
The people can't be riding motorcycles and driving cars at the same time.
exists e2 e1 x1 x2 x3 x4 x5 x6 x7.(n_road(x5) & a_topic(x1) & of(x1,x2) & down(e1,x5) & Theme(e2,x7) & Actor(e2,x6) & v_wear(e2) & n_helmet(x7) & (x5 = x6) & on(e1,x4) & n_motorcycle(x4) & Actor(e1,x3) & v_ride(e1) & (x2 = x3) & n_people(x2) & n_group(x1))
exists e1 x1 x2 x3 x4.(n_road(x4) & down(e1,x4) & Theme(e1,x3) & Actor(e1,x1) & v_drive(e1) & n_car(x3) & of(x1,x2) & n_people(x2) & n_group(x1))