in what way is the true arch better than the corbel arch
Corbel arch Although an improvement in load-bearing efficiency over the post and lintel design, corbeled arches are not entirely self-supporting structures, and the corbeled arch is sometimes termed a "false arch" for this reason. Unlike "true" arches, not all of the structure's tensile stresses caused by the weight of the superstructure are transformed into compressive stresses. Corbel arches and vaults require significantly thickened walls and an abutment of other stone or fill to counteract the effects of gravity, which otherwise would tend to collapse each side of the archway inwards.[citation needed]
Infinity Bridge The bridge is a dual, tied arch bridge or bowstring bridge. It has a pair of continuous, differently-sized structural steel arches with suspended precast concrete decking[2][4][9] and one asymmetrically placed river pier. The tapering arches with a trapezoidal box section are fabricated from weathering steel plate.[10] The arches both bifurcate within the spans to form a double rib over the river pier.[19][20][21] A reflex piece between the two arches holds them together[10] making the two arches one continuous curve. No other bridge is known to have quite the same design.[2][4]