A crowd of people are gathered at the start sign for the walk.
A group of people gather at the start line.
The start sign is generally considered as a start line.
exists e1 x1 x2 x3 x4 x5.(n_walk(x5) & n_sign(x3) & of(x3,x4) & n_start(x4) & for(e1,x5) & at(e1,x3) & Theme(e1,x1) & v_gather(e1) & of(x1,x2) & n_people(x2) & n_crowd(x1))
exists e1 x1 x2 x3 x4.(n_start(x4) & at(e1,x4) & Theme(e1,x3) & Actor(e1,x1) & v_gather(e1) & n_line(x3) & of(x1,x2) & n_people(x2) & n_group(x1))