Which term refers to the space limit for carriageway and sidewalk to ensure traffic safety above the bridge?

• A. Clearance above bridge floor
• B. Span Length
• C. Deck Width
• D. Total Bridge Length

Answer: (A)

Vertical clearance is the headroom available above the roadway on a bridge. It defines the minimum distance from the bridge deck (the floor you drive on) to the lowest overhead part of the structure or any obstructions above it, ensuring tall vehicles and pedestrians can pass safely. This headroom is what keeps vehicles from striking undersides, signs, or utilities on or near the bridge. The other terms describe horizontal or overall dimensions—span length between supports, deck width across the roadway, and total bridge length—so they don’t address the necessary vertical space for safe passage.