What is the classification for sheets that do not have any prefixes?

The classification for sheets that do not have any prefixes is indeed roadway plans. This is because roadway plans are typically presented without specific prefixes that might denote other categories, such as structures or signalization. Instead, they encompass the general layouts and details relevant to the road itself, including alignment, grading, and other essential elements pertaining to the road design.

In contrast, other classifications such as structure plans, signalization plans, and traffic design plans often have specific prefixes that help to identify them as distinct categories from the general roadway plans. Structure plans usually focus on the details of bridges, culverts, and other structural elements associated with roadways. Signalization plans detail traffic signals and their placements, while traffic design plans encompass broader aspects of traffic management and control. Thus, when dealing with sheets lacking any prefixes, it is accurate to categorize them straightforwardly under roadway plans.