A group of people on the side of a busy street.
People are by a busy street.
"On the side of a busy street" is another way to say "by a busy street".
exists s1 x1 x2 x3 x4.(n_side(x3) & a_topic(x1) & of(x1,x2) & on(x2,x3) & of(x3,x4) & n_street(x4) & a_busy(s1) & Theme(s1,x4) & n_people(x2) & n_group(x1))
exists p1 x1.(exists s1 x2.(by(x1,x2) & n_street(x2) & a_busy(s1) & Theme(s1,x2)) & n_people(x1))