What does an up sloping runway likely cause during an approach?

An up sloping runway during an approach can create the illusion of being higher than normal. This occurs because pilots reference their surroundings to gauge altitude, and an upward incline may mislead their perception. As the runway ascends, the ground and horizon appear to drop away more steeply, causing pilots to believe they are at a higher altitude than they actually are. This can lead to an increased risk of overcorrecting and potentially resulting in a lowered approach or another misjudgment during landing. Understanding this visual illusion is crucial for pilots, as it impacts their visual references and could affect their decisions during critical phases of flight such as landing approaches.