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The United States is home to more than 623,000 bridges, with nearly 5 billion motor vehicles crossing those structures every day, according to the American Society of Civil Engineers. In order to help ensure bridge safety, every bridge in the federal road system must be inspected at least every two years with some being inspected monthly depending on the condition of the bridge.

One of the most effective methods is using an underbridge inspection unit (UBI). UBIs are specialized trucks with a boom that reaches out over and under a bridge to allow access beneath the structure. They¡®re particularly useful with a very high, vertical distance over water. ?

¡°Underbridge inspection units are great when it comes to certain bridge types like large steel girder bridges over massive canyons where drones or rope access do not work,¡± said Craig Jenkins, bridge inspection team lead and structural inspection engineer with Â鶹´«Ã½, an engineering, architecture, and environmental consulting firm.

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