In which visual scenario would monocular depth cues be particularly useful?

Monocular depth cues are particularly useful in scenarios where depth perception is required from a single eye's perspective. In assessing an object's height from a distance, monocular cues such as relative size, linear perspective, and texture gradient come into play. For instance, an observer may judge how tall an object appears compared to other known objects in the environment, or by considering the convergence of parallel lines as they recede into the distance, which provides additional context about the object's height.

The other scenarios do not emphasize depth in the same way. Identifying color shades primarily relies on light and color perception rather than depth perception. Observing detailed textures can require close proximity and often benefits from binocular cues to appreciate fine differences in surface details. Determining the speed of moving objects, while it might involve some depth cues, is mostly based on motion perception and isn't specifically reliant on depth cues derived from a single eye. Therefore, assessing height incorporates distinct monocular depth cues, making it the most appropriate choice for this question.