The effect of grade on safe overtaking sight distance is -

- 1
  
  to increase it on descending grades and to decrease it on ascending grades.
- 2
  
  to decrease it on descending grades and to increase it on ascending grades.
- 3
  
  to increase it on both descending and ascending grades.
- 4
  
  to decrese it on both descending and ascending grades.

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