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HS&E HIW practice question: Excavations in the highway (1 of 6)

E. Specialist: Highway works A free question from our original HS&E HIW practice exam. Try it, then open the answer to see why each option is right or wrong.

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A trench is to be dug across a road to lay a new duct.

When should you decide what temporary support it needs?

Choose one answer.

  1. A. Only if it rains
  2. B. Before digging starts
  3. C. Once the sides start to crack
  4. D. After the first shift
Show the answer and explanation

Answer: B

  • A. Wrong: Wrong. Dry trenches can collapse too.
  • B. Right: Right. HSE says decide what temporary support will be needed before digging any trench or excavation.
  • C. Wrong: Wrong. By then a collapse could already happen.
  • D. Wrong: Wrong. Plan the support before any digging.

Explanation

Plan the temporary support for an excavation before you start digging.

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