People strolling casually across a bridge.
People on a bridge
People could be strolling across a bridge.
exists e1 s1 x1 x2 x3.(a_topic(x1) & across(e1,x3) & n_bridge(x3) & a_casually(s1) & Manner(e1,s1) & Actor(e1,x2) & v_stroll(e1) & (x1 = x2) & n_people(x1))
exists x1 x2.(a_topic(x1) & on(x1,x2) & n_bridge(x2) & n_people(x1))