Canopies, loading docks, and other open-walled structures must be shown by which type of lines on drawings?

• A. Solid lines
• B. Broken lines
• C. Dashed lines
• D. Dotted lines

Answer: (B)

Open-walled features like canopies and loading docks aren’t true, fully enclosed edges, so the drawing needs a line that signals a boundary that isn’t a solid wall. Broken lines accomplish this by using short segments with gaps, which communicates that the edge is not a continuous structure. Solid lines would imply a solid, enclosed wall, dashed lines are typically used for hidden features behind or inside objects, and dotted lines often indicate centerlines or reference paths. Therefore, broken lines best represent these open-walled areas on drawings.