What is the requirement for loading open-top loads on flat cars regarding clearance restrictions?

The requirement for loading open-top loads on flat cars emphasizes the need for proper clearance checks, especially when approaching areas with known restrictions. This is crucial because open-top loads can potentially exceed height limits, which can result in safety hazards or damage to infrastructure such as bridges and tunnels. Ensuring that all movements are cleared with the proper authority helps maintain safety standards and regulatory compliance by confirming that the load is within the allowable dimensions for the specific route.

The other options do not adequately address the necessary procedures for handling clearance issues associated with loading practices. Avoiding the need for special clearance checks disregards the importance of safety and compliance. While loading quickly is generally a goal, it cannot take precedence over safety protocols, such as ensuring proper clearance. Lastly, asserting that height and width do not impact loading procedures overlooks the critical nature of these factors in transportation logistics and safety.