i mean in construction, earthquake resistance..etc
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Suspension bridges have a high strength to weight ratio. They are flexible (can also be disadvantage) and can span long distances with no piers therefore good on very high places, across water etc. and they require little access from below aiding construction. They can be very thin and therefore less visible. They have an elegant look.
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They are best for long span & good for earthquack if its supporting ends are on good soil strata.Pavment should be flexible enough to allow vibrations of quack.