Analysis: Eye in the sky


It is not surprising that it can be difficult to gain access for close inspection under bridges as, by their very nature, they provide links where none exist otherwise.

Clearly the ideal is for the inspector to get within touching distance of every part of the structure, but providing safe access can be expensive and time-consuming and there is a growing recognition that much useful information can be gathered by sending out an unmanned aerial vehicle, often referred to as a drone.

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