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The sight distance is defined as the:
1. length of the roadway a driver can see ahead at any particular time.
2. nautical distance for which ships can continue signaling
3. length of the runway
4. total length of road to be traversed

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Correct Answer - Option 1 : length of the roadway a driver can see ahead at any particular time.

Concept:

Sight distance available from a point is the actual distance along the road surface, over which a driver from a specified height above the carriageway has visibility of stationary or moving objects. Three sight distance situations are considered for design:

  • Stopping sight distance (SSD) or the absolute minimum sight distance
  • Intermediate sight distance (ISD) is defined as twice SSD
  • Overtaking sight distance (OSD) for safe overtaking operation
  • Headlight sight distance is the distance visible to a driver during night driving under the illumination of headlights
  • Safe sight distance to enter into an intersection

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