The 'two-theodolite method' for setting out a curve is used when:
Choose the correct answer
Only short curves (< 50 m radius)
Chaining is impractical (water, slope, jungle) — two instruments locate each curve point by angle intersection only
Only GPS surveys can use this method
Only for vertical curves, not horizontal
Correct Answer
B. Chaining is impractical (water, slope, jungle) — two instruments locate each curve point by angle intersection only
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Two-theodolite method: instruments at both ends of curve (T1 and T2); both set deflection angles simultaneously; point found at intersection of two lines of sight. No chain measurement needed — useful when taping is difficult: dense bush, slopes, water bodies. Required: both tangent lengths known; both theodolites; flag person at intersection. Accurate but requires two instruments and good visibility.
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