New York and other states are outfitting aging bridges with wireless technology to offer more precise safety information than visual inspection alone can provide. The new technology, known as structural health monitoring, or SHM, uses embedded sensors to report on a bridge's loads, cracks, corrosion and fatigue. With a price tag of about $200 each, the sensors are seen as a cost-effective means for keeping tabs on New York's 17,000 bridges.

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