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In yard areas, where vehicles operate in close proximity to pedestrians and other hazards, safety is paramount. The maximum speed limit is often set to minimize the risk of accidents while still allowing for efficient movement of vehicles.

A limit of 15 MPH strikes a balance between safety and operational practicality. This speed is slow enough to allow vehicle operators to react quickly to unforeseen obstacles or concerns but fast enough to ensure that operations within the yard can proceed without significant delays. Maintaining this speed ensures that both the operators of vehicles and pedestrians can coexist safely, reflecting an important emphasis on safety protocols in environments where interactions between different types of traffic are common.

Higher speed limits, like 20 MPH or 25 MPH, would increase the risk of accidents significantly in such congested areas where visibility might be limited and where quick stopping distances are critical. Thus, the choice of 15 MPH aligns with industry standards aimed at protecting the well-being of all individuals present in yard areas.