A large crowd of people on motorcycles and several dozen cars wait behind a crosswalk.
The motorcycle/car club are concerned about the safety of the people on the streets.
Waiting behind crosswalk doesn't mean they are concerned about safety of people.
exists e1 s1 s2 x1 x2 x3 x4 x5 x6 x7.(behind(e1,x7) & n_crosswalk(x7) & Actor(e1,x1) & v_wait(e1) & on(x1,x3) & subset_of(x5,x3) & n_car(x5) & of(x5,x6) & n_dozen(x6) & a_several(s2) & Theme(s2,x5) & subset_of(x4,x3) & n_motorcycle(x4) & of(x1,x2) & n_people(x2) & n_crowd(x1) & a_large(s1) & Theme(s1,x1))
exists e1 x1 x2 x3 x4 x5.(n_street(x5) & n_people(x4) & n_safety(x3) & n_club(x1) & of(x1,x2) & n_motorcycle/car(x2) & about(e1,x3) & of(x3,x4) & on(x4,x5) & Theme(e1,x1) & v_concern(e1))