What type of openings must a swimming pool enclosure not have?

In the context of swimming pool safety, the design of enclosures is crucial to prevent accidental drownings, especially in areas where children might have access. The correct response indicates that horizontal openings must be restricted to ensure safety.

Horizontal openings in a swimming pool enclosure can create opportunities for small children to climb or squeeze through. Unlike vertical or diagonal openings, which are often less accessible for young children, horizontal openings could be at a level that allows them to easily reach and potentially escape the enclosure.

By restricting these horizontal openings, enclosures can provide a more secure barrier, minimizing the risk of unintended access to the pool area. Safety standards typically emphasize the importance of designing pool enclosures to eliminate any gaps or openings that could be exploited, thereby enhancing overall safety around swimming pools.