This differ from any of the other combinations previously described because the focus is centered around a member subjected to countless repetitions (referred to as cycles) of a "normal" live load in an average climate, rather than a "worst-case" live load or during an extreme weather event.

• A. Fatigue and Fracture limit states
• B. Service III
• C. Extreme-Event limit states
• D. Strength I Load Combination

Answer: (B)

In bridge design, different load combinations are used to represent how a structure behaves under distinct conditions. The description focuses on a member that experiences many cycles of normal live load over time, in an average climate, rather than a single extreme load or a storm event. That pattern matches service-level conditions, where the goal is to assess long-term performance during typical operation and environmental exposure. A service-category combination like Service III is specifically used to capture these repeated, everyday loads and their accumulated effects on deflections, cracking, and vibration over the structure’s life. It differs from extreme-event limit states, which model rare, high-impact loads, and from the strength (ultimate) checks that look at maximum capacities. While fatigue concerns can arise from repeated loading, the service-level category described is the one designed to represent ordinary traffic over time, making it the best fit for the scenario.