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The Application to the Transportation Industry of Advancing Drone Use Beyond Visual Inspection: The Emergence of Contact Based Nondestructive Testing (NDT) at Height Utilizing Aerial Robotic Systems

Nondestructive testing (NDT) of transportation infrastructure is critical for evaluating existing material deficiencies and suitability for safe continued service. While NDT inspection programs dramatically increase the safety and integrity of our infrastructure, access requirements in performing these inspections introduces risk. Inspection sites often require access to elevated areas via equipment such as personal fall protection (safety harness and lanyard), ladders, scaffolding, inspection trucks with elevated baskets, rope work, catwalks, and rigging. Working at height creates a safety risk to the worker performing the inspection, and cause work zones and traffic detouring creating vulnerable environments that increase the potential for crashes. Unmanned aerial vehicles (UAVs), or drones, can improve the safety and efficiency of transportation infrastructure by performing the inspection with workers safe on the ground. In 2016, the American Association of State Highway and Transportation Officials (AASHTO) reported that 17 state Departments of Transportation (DOT) had either used or tested drones (i.e. UAVs) for work within the transportation industry. The Michigan DOT and Michigan Tech Research Institute conducted a study in 2014 which reported that drones were a safe, reliable, and cost effective tool for visual bridge inspections. Drone inspections thus far have been limited to visual testing (VT). While VT is a primary method of inspection, it is not sufficient in identifying or further evaluating material deficiencies such as metal thickness, small fatigue cracks in welds, or subsurface flaws. To adequately detect these deficiencies, advanced inspection NDT methods, such as ultrasonic testing (UT), are required. Aerial robotic systems have been developed to perform advanced NDT inspection of materials at height. Emergence of this technology is discussed in reference to the transportation industry.



  • Custers, Bart. (2016) Drones Here, There and Everywhere Introduction and Overview. In: Custers, Bart. (eds) The Future of Drone Use. Information Technology and Law Series, vol 27. T.M.C. Asser Press, The Hague.
  • Bellamy, Woodrow. “US Now has 60,000 Part 107 Drone Pilots.” Avionics. 7 September, 2017. Retrieved from
  • The American Society for Nondestructive Testing. (n.d.). Introduction to Nondestructive Testing. Retrieved from
  • Code of Federal Regulations, “National Bridge Inspection Standards” – 23CFR650. U.S. Government Printing Office via GPO Access, revised April 1, 1998, pp. 238-240.
  • Dorsey, Tony. 35 State DOTs are Deploying Drones to Save Lives, Time and Money. AASHTO News. 27 March, 2018. Retrieved from
  • National Census of Fatal Occupational Injuries in 2016. Bureau of Labor Statistics, U.S. Department of Labor. 19 December, 2019. Retrieved from
  • Brooks, Colin et. al. Evaluating the Use of Unmanned Aerial Vehicles for Transportation Purposes. Michigan Tech Research Institute, and Michigan Technological University. 7 April, 2015.
  • Survey Finds a Growing Number of State DOTS are Using Drones to Improve Safety and Collect Data Faster and Better- Saving Time and Money. Transportation TV AASHTO Special Report. Retrieved from
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