Many people run in a race on a street.
A man runs in traffic
A man implies the presence of one person whereas many people implies more than one person.
exists e1 x1 x2 x3.(in(e1,x2) & on(x2,x3) & n_street(x3) & n_race(x2) & Actor(e1,x1) & v_run(e1) & n_people(x1) & n_quantity(x1))
exists e1 x1 x2.(in(e1,x2) & n_traffic(x2) & Actor(e1,x1) & v_run(e1) & n_man(x1))