Which of the following describes the three primary inspection methods used in bridge inspection?

The three primary inspection methods used in bridge inspection are best described as visual, physical, and advanced.

Visual inspection is the most fundamental and widely used method, where inspectors examine the bridge’s components and overall structure for signs of distress, corrosion, and deterioration. This method relies on the inspector's observational skills to identify visible issues that may require more in-depth analysis or immediate attention.

Physical inspection takes the process a step further, involving hands-on examinations of the structure. Inspectors may probe, tap, or use tools to assess material conditions and structural integrity that might not be observable through visual means alone. This method helps to uncover hidden structural problems that could compromise safety.

Advanced inspection methods are utilized when initial assessments suggest significant issues that warrant more in-depth investigation. This can include techniques like non-destructive testing (NDT), load testing, and the use of advanced technologies such as drones or imaging systems that provide detailed internal assessments of the bridge.

Understanding these three methods—visual, physical, and advanced—is essential for ensuring the safety and longevity of bridges, as they encompass a comprehensive approach to identifying and evaluating structural conditions.