Consider the following distances:

d1 = distance travelled by the vehicle after applying the breaks.

d2 = distance travelled by overtaking vehicle, during reaction time for overtaking.

d3 = distance travelled by overtaking vehicle, during total overtaking time.

d4 = distance travelled by overtaken vehicle, during total overtaking time.

The Overtaking Sight Distance, on a road with one-way traffic will be equal to:

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  1. d1 + d2 + d3 + d4
  2. d1 + d2 + d3 
  3. d3 + d4
  4. d2 + d3 

Answer (Detailed Solution Below)

Option 4 : d2 + d3 
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Detailed Solution

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Overtaking sight distance:

  • It is equal to the distance covered during reaction time plus the distance covered during overtaking operation plus the distance covered by the opposing traffic.
  • If both sides of traffic are present then for calculating OSD, the distance covered in reaction time (d1) plus the distance covered during overtaking operation (d2) and the distance covered by overtaking vehicle (d3) have to be taken into consideration.

  • If one-way traffic is present, then for calculating OSD, the distance covered during overtaking operation (d2) and the distance covered by overtaking vehicle (d3) have to be taken into consideration.

Additional Information

  • The Minimum length of the overtaking zone = 3 x OSD
  • The maximum length of the overtaking zone = 5 x OSD
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