Which method improves the display of layers on maps?

Improving the display of layers on maps often involves enhancing the clarity and visibility of important features. Adjusting or digitizing roads contributes significantly to this goal. By refining the representation of roads—whether through correcting inaccuracies in their geometry, ensuring proper alignment, or enhancing their visual attributes such as color and thickness—map readers can better interpret the spatial relationships and navigational aspects. This process increases the overall readability and usability of the map.

In contrast, removing all features would lead to an ineffective map, as it would eliminate all contextual information necessary for understanding spatial relationships. Using grayscale color schemes may simplify a map’s appearance, but it could also reduce differentiation between essential features, potentially making it difficult for users to distinguish between different types of data or layers. Limiting data to three layers might help manage complexity, but it could compromise the richness of information provided, especially if more layers are relevant to the user's needs. Therefore, enhancing the representation of critical features—like adjusting roads—provides the best improvement to layer displays on maps.