Four men in orange vests work on a road at night.
Four men in orange vests are working overtime.
They could be working their normal shifts and not pulling overtime. That can't be implied.
exists e1 x1 x2 x3 x4 x5.(at(e1,x5) & n_night(x5) & on(e1,x4) & n_road(x4) & Actor(e1,x1) & v_work(e1) & in(x1,x2) & n_vest(x2) & of(x2,x3) & n_orange(x3) & n_man(x1) & card_eq_4(x1))
exists e1 s1 x1 x2 x3.(a_overtime(s1) & Manner(e1,s1) & Actor(e1,x1) & v_work(e1) & in(x1,x2) & n_vest(x2) & of(x2,x3) & n_orange(x3) & n_man(x1) & card_eq_4(x1))