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Manhole covers are predominantly designed in a circular shape primarily for geometric and safety-related reasons that have solidified over decades of civil engineering practice. Unlike square or rectangular lids, a circular cover cannot accidentally fall through its own opening, regardless of the angle at which it is manipulated, which significantly enhances the safety of both maintenance workers and the general public. Furthermore, the round design allows for easier transport, as a worker can simply roll the heavy cover along the ground rather than lifting it, and the circular frame distributes traffic-induced stress more evenly across the surrounding pavement, thereby increasing the overall structural durability of the installation. From a logistical perspective, round covers are also simpler to manufacture and do not require specific alignment to fit into the frame, making them the most efficient and reliable choice for subterranean access infrastructure.