Under span length classifications, which category applies to Culverts L ≤ 20 ft?

• A. Culverts L ≤ 20ft
• B. Short Span Bridges
• C. Long Span Bridges
• D. Medium Span Bridges

Answer: (A)

Span length classifications separate the smallest, drainage-focused openings from bridges. A culvert is used for very short spans, typically carrying water under roads, and the threshold used is 20 ft. So when the span length is L ≤ 20 ft, it falls into the culvert category, not a bridge category. This is why the category that explicitly states Culverts L ≤ 20 ft is the proper fit: it reflects that for these small spans, the structure is considered a culvert rather than a short, medium, or long span bridge.