What is the minimum vertical clearance for a fire lane?

• A. 15 feet (4.6 m)
• B. 20 feet (6 m)
• C. 13 feet, 6 inches (4.1 m)
• D. 10 feet, 6 inches (3.2 m)

Answer: (C)

The space above a fire lane must be tall enough so that fire apparatus and their equipment can pass without striking an overhead obstacle. The widely accepted minimum overhead clearance for a fire lane is 13 feet 6 inches (about 4.1 meters). This height accounts for typical fire engines plus rooftop equipment, ladders, and mirrors, while still providing a safety margin.

Choosing a higher clearance isn’t the “minimum” requirement, though some jurisdictions may demand more in certain situations. A clearance of 10 feet 6 inches would be too low for most standard apparatus, risking collisions, whereas 15 feet or 20 feet exceeds the minimum needed in most cases.