For my Diorama i made a Set of 3D Printable roadside barriers in HO scale. They are scaleable if you want. I used the Sectiondrawing of one of the Manufacturers for those barriers in Norway. The holes are for small wires to imitate the guide poles for snowplows.
Height: 9mm width at the base: 6mm straight parts: length: ~17.5mm ~30.5mm ~44mm ~57.5mm with or without Rain Drainage
as well as an end piece 45° piece