Workers standing in a work zone.
We are riding in the danger zone
Riding requires sitting, not standing.
exists e1 x1 x2 x3.(in(e1,x2) & n_zone(x2) & of(x2,x3) & n_work(x3) & Actor(e1,x1) & v_stand(e1) & n_worker(x1))
exists e1 x1 x2 x3.(n_zone(x2) & of(x2,x3) & n_danger(x3) & n_person(x1) & in(e1,x2) & Actor(e1,x1) & v_ride(e1))