REVERSE curveA TYPE of Horizontal curve.Formed when two curves of different radii R1 and R2 turning in opposite directions.Extra Points:Curves are classified in two categories :Horizontal Curve :Formed by joining the two intersecting lines in a horizontal plane.Used to connect two roads meeting at some angle.For EXAMPLE: TRANSITION curvesVertical Curves: Formed by joining two intersecting lines in a vertical plane.Used to connect two roads of a lowermost point of a valley.For example : Sag curvesThese are further classified as follows:Horizontal CurvesVertical CurvesSimple circular curveCompound curveReverse curveTransition curveCombined CurveBroken back curveSag curveSummit curve