The 'traverse closure error' tolerance for a third-order theodolite traverse is approximately:
Choose the correct answer
Always exactly zero (no tolerance)
≤ 20√n arcseconds angular + linear 1:5000 to 1:10,000 for third-order traverse
More than 1 degree per side
Same as first order: 5√n arcseconds
Correct Answer
B. ≤ 20√n arcseconds angular + linear 1:5000 to 1:10,000 for third-order traverse
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Traverse angular misclosure: (1) First order: ≤ 5√n arcseconds (n = number of stations); (2) Second order: ≤ 10√n; (3) Third order: ≤ 20√n arcseconds. Linear misclosure: 1:5000 to 1:10,000 for third order. Distribution: proportional to distance (Bowditch rule) or equal per station (Transit rule). IS 5254 specifies levelling accuracies. Angular errors close by distributing equally among all angles.
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