Which phrase accurately completes the given statement about road atlases?

The phrase that accurately completes the statement about road atlases emphasizes the nature of the maps found within them. Choosing the phrase about very few road atlases having such detailed maps suggests that detailed maps are not the norm, aligning with the implicit understanding of road atlases as containing a variety of map types, not exclusively detailed ones.

This choice conveys the idea that while some road atlases may include detailed maps, many do not focus on this aspect, indicating a limitation in their coverage. The statement would resonate with users who expect a range of map types from road atlases, which generally serve more as navigational aids than as detailed geographical resources.

The other choices imply either a prevalence of detailed maps or express a less assertive stance regarding their availability. However, such implications do not align as strongly with the notion that detailed maps are not common in road atlases, making the selected choice more suitable for the intended completion of the statement.