Question: What is the purpose of a sight distance in geometric design?

Options:

1. To determine the length of the road
2. To ensure drivers can see obstacles in the roadway
3. To calculate the pavement thickness
4. To assess traffic volume

Correct Answer: To ensure drivers can see obstacles in the roadway

Solution:

Sight distance is critical for ensuring that drivers can see and react to obstacles, enhancing safety on the roadway.