The man is holding a SLOW sign.
The man is holding a traffic sign at an intersection near a school.
You can not infer there is traffic.
exists e1 x1 x2 x3.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_sign(x2) & (x2 = x3) & ne_org_slow(x3))
exists e1 x1 x2 x3 x4 x5.(n_man(x1) & at(e1,x4) & near(x4,x5) & n_school(x5) & n_intersection(x4) & Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_sign(x2) & of(x2,x3) & n_traffic(x3))