I prefer woods in the median to block oncoming lights at night and prevent head-on collisions for vehicles that manage to cross over the inner shoulder. Obviously, there needs to be an adequate deceleration buffer between the inner shoulder and the first tree, however. When there's not trees or shrubbery (Ni!), I prefer wildflower planted medians and ditches to reduce the need for mowing and change up the scenery a bit, along with a cable barrier for safety and fewer U-turn points for the local toll collectors.