Practice Quiz

Civil Engineering PE

Category - Transportation

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Which of the following provides the best comparison of intersection site distance (ISD) to stopping sight distance (SSD)?
  1. ISD is often greater than SSD
  2. ISD is often less than SSD
  3. ISD and SSD are generally the same
  4. None of the above
Explanation
Answer: A - ISD is often greater than SSD. SSD is the distance a vehicle travels once a driver identifies the need to stop and the vehicle is stops. While approaching and while at an intersection, a driver needs to be able to determine if it is safe to proceed through the intersection, or to turn left or right. As such, ISD is often greater than SSD to include the time/distance to consider options.
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