As used in this chapter, unless the context requires a different meaning: “Limited access highway” means a highway especially designed for through traffic, over which abutters have no easement or right of light, air, or access by reason of the fact that their property abuts upon such limited access highway. “Scenic highway” means a highway, designated as such by the Board, within a protected scenic corridor located, designed, and constructed so as to preserve and enhance the natural beauty and cultural value of the countryside. “Virginia byway” means a highway, designated as such by the Board, having relatively high aesthetic or cultural value, leading to or within areas of historical, natural, or recreational significance.