Which term best describes loads that result from inertia and dynamic effects of moving vehicles on the bridge?

• A. Live Load
• B. Bridge Loads
• C. Buoyancy Effect
• D. Water Current

Answer: (A)

In bridge design, loads from moving vehicles are categorized as live loads because they are variable, can move across the structure, and include dynamic effects. The inertia of a vehicle and the bridge’s response create temporary peaks beyond the vehicle’s static weight, and design standards apply dynamic or impact factors to capture these effects within the live-load category. The other terms refer to different phenomena: buoyancy is the fluid-acting force on submerged parts, water current is a hydrodynamic load, and a generic term like bridge loads isn’t a standard category. So the best term for these moving-vehicle effects is live load.