ARCH BRIDGE- works by transferring the weight of the bridge and its loads partially into a horizontal thrust restrained by the abutments at either side.� Arch bridges are constantly under compression.� The compression is the force downward from the road of walkway and the tension is the force outward from the bottom of the arch.

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CABLE-STAYED BRIDGE- has greater stiffness than the suspension bridge, so that deformations of the deck under live loads are reduced.� The cables act as temporary and permanent supports to the bridge deck.� A further advantage of the cable-stayed bridge is that any number of towers may be used.

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TRUSS BRIDGE- composed of connected elements which may be stressed from tension, compression, or sometimes both in response to dynamic loads.� Trusses are assumed to be pin jointed where the straight components meet.�

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