In corridor terminology, which term describes an alignment-profile pair with an attached assembly?

• A. Centerline
• B. Anchor
• C. Baseline
• D. Reference

Answer: (C)

In corridor work, the essential reference that defines the path and the elevations along which a cross-section is built is the baseline. A baseline is an alignment that has an associated profile, and a cross-section assembly is attached to that baseline to create the corridor geometry. So, when you have an alignment-profile pair with an attached assembly, you’re describing the baseline. The term centerline refers more generally to a type of alignment, while anchor and reference aren’t the terms used to describe this path-and-profile-with-assembly concept.