According to IRC:52-1973, for a single lane National Highway in hilly region,

- 1
  
  width of the carriageway must be 3.75 m
- 2
  
  shoulders on either side must be 1.25 m
- 3
  
  total width of the road-way must be 6.25 m
- 4
  
  all of the above

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