Arlington County has an extensive network of bicycle infrastructure, including 50 miles of shared-use off-street trails. These multi-use trails are generally 10 feet wide with a solid yellow line striped down the middle to separate users.
Constructive mathematics. Idea. Broadly speaking, constructive mathematics is mathematics done without the principle of excluded middle (or other principles, such as the full axiom of choice, that imply it).
Meaning: Constructing or tending to construct or improve or promote development. Context examples: constructive criticism / a constructive attitude / a constructive philosophy / constructive permission. Similar: creative (promoting construction or creation) formative; plastic; shaping (forming or capable of forming or molding or fashioning)