Wher­ev­er any high­way, con­struct­ed by the Coun­ty, which is the main­te­nance respon­si­bil­i­ty of the Coun­ty, and tra­vers­es or adjoins the sub­di­vi­sion, the sub­di­vider shall reserve a right‑of‑way hav­ing a width of not less than fifty (50) feet from the cen­ter line of any Coun­ty high­way and thir­ty (30) feet from the cen­ter line of any road dis­trict high­way in the Coun­ty.