Broken back curve. Broken back curves are unsightly and undesirable. A reverse curve consists of two adjoining circular arcs with the arc centers loc ed on opposite sides of the alignment. A reverse curve consists of two adjoining circular arcs with the arc centers located on opposite sides of the alignment. The “broken-back” or “flat-back” arrangement of curves (with a short tangent between two curves in the same direction) should be avoided except where very unusual topographical or right-of-way conditions make other alternatives impractical. The AASHO publications, A Policy on Geometric Design of Rural Highways, 1954 & 1965 and A Policy on Design of Urban Highways and Arterial Streets, 1973 defined a broken-back curve as having the tangent being less than 1500-ft. The combination of a short length of tangent between two circular curves is referred to as a broken-back curve. Curve – Compound. Curve provided to connect two roads meeting at an angle. Broken-back curves are two closely-spaced horizontal curves, of the same or different radii, with deflections in the same direction and a short tangent between the curves. Horizontal curves are further classified as: (a) Simple circular curve (b) Compound curve (c) Reverse curve (d) Transition curve (e) Combined curve (f) Broken-back curve Note: Compound and reverse curves are provided for low speed, roads and railways. bnw tvhri qbiz hphcm xtlym eu ou w5c f8jap 3jfis