Flared intersection is one of ___________a.Both of themb.At grade intersectionc.Interchanged.None

The correct option to fill in the blank is b. At grade intersection.

A flared intersection refers to a design feature in roadways where the corner of an intersection is widened, allowing for smoother turning movements and improving sight distance for drivers. This type of intersection is often found at at-grade intersections, which are crossings of two or more roads at the same level without any elevation differences. The flaring enhances the operational efficiency of the intersection by accommodating larger vehicles and promoting safer turning radii. It does not pertain to interchanged intersections, which involve grade separation where roads are elevated over or under one another. Therefore, the best choice that accurately fits the context is "At grade intersection."