A straight 135-foot trench is at least 4 feet deep and has unobstructed walking throughout. Safe access points may be located anywhere; no endpoint access is separately required. Considering only the 25-foot maximum lateral travel to an access point, what minimum number is needed?
Correct Answer
A) 3 points.
Three points at 22.5, 67.5 and 112.5 feet keep travel within 22.5 feet. Each point can cover at most 50 feet of trench, so two cover at most 100 feet and cannot cover 135. Three is therefore the minimum under these assumptions. Source: https://www.dir.ca.gov/title8/1541.html
Why This Is the Correct Answer
Three points at 22.5, 67.5 and 112.5 feet keep travel within 22.5 feet. Each point can cover at most 50 feet of trench, so two cover at most 100 feet and cannot cover 135. Three is therefore the minimum under these assumptions. Source: https://www.dir.ca.gov/title8/1541.html
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